Fix errors caught by go vet in compliance package

`go test` implicitly runs `go vet` and fails the tests if vet
errors are found.  Fix all the issues found by vet.

Test: go test build/make/tools/compliance/...
Change-Id: If0684cf124ece4931af440008cd44a61c22de475
diff --git a/tools/compliance/policy/policy_test.go b/tools/compliance/policy/policy_test.go
index 09e831c..32dd5fd 100644
--- a/tools/compliance/policy/policy_test.go
+++ b/tools/compliance/policy/policy_test.go
@@ -226,7 +226,7 @@
 			fs[tt.edge.dep] = []byte(meta[tt.edge.dep])
 			lg, err := ReadLicenseGraph(&fs, stderr, []string{tt.edge.target})
 			if err != nil {
-				t.Errorf("unexpected error reading graph: %w", err)
+				t.Errorf("unexpected error reading graph: %s", err)
 				return
 			}
 			edge := lg.Edges()[0]
diff --git a/tools/compliance/policy/resolve_test.go b/tools/compliance/policy/resolve_test.go
index 09dd7dd..f98e4cc 100644
--- a/tools/compliance/policy/resolve_test.go
+++ b/tools/compliance/policy/resolve_test.go
@@ -332,7 +332,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 
@@ -643,7 +643,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 
diff --git a/tools/compliance/policy/resolvenotices_test.go b/tools/compliance/policy/resolvenotices_test.go
index 275c0a5..cd9dd71 100644
--- a/tools/compliance/policy/resolvenotices_test.go
+++ b/tools/compliance/policy/resolvenotices_test.go
@@ -457,7 +457,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			expectedRs := toResolutionSet(lg, tt.expectedResolutions)
diff --git a/tools/compliance/policy/resolveprivacy_test.go b/tools/compliance/policy/resolveprivacy_test.go
index 2072d22..e8c953a 100644
--- a/tools/compliance/policy/resolveprivacy_test.go
+++ b/tools/compliance/policy/resolveprivacy_test.go
@@ -76,7 +76,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			expectedRs := toResolutionSet(lg, tt.expectedResolutions)
diff --git a/tools/compliance/policy/resolveshare_test.go b/tools/compliance/policy/resolveshare_test.go
index f73888d..c451b86 100644
--- a/tools/compliance/policy/resolveshare_test.go
+++ b/tools/compliance/policy/resolveshare_test.go
@@ -286,7 +286,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			expectedRs := toResolutionSet(lg, tt.expectedResolutions)
diff --git a/tools/compliance/policy/shareprivacyconflicts_test.go b/tools/compliance/policy/shareprivacyconflicts_test.go
index 2d2a1d0..069daa2 100644
--- a/tools/compliance/policy/shareprivacyconflicts_test.go
+++ b/tools/compliance/policy/shareprivacyconflicts_test.go
@@ -99,7 +99,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			expectedConflicts := toConflictList(lg, tt.expectedConflicts)
diff --git a/tools/compliance/policy/shipped_test.go b/tools/compliance/policy/shipped_test.go
index 25f6af0..3ae9b46 100644
--- a/tools/compliance/policy/shipped_test.go
+++ b/tools/compliance/policy/shipped_test.go
@@ -108,7 +108,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			t.Logf("graph:")
diff --git a/tools/compliance/policy/walk_test.go b/tools/compliance/policy/walk_test.go
index a2ec6e7..92867f9 100644
--- a/tools/compliance/policy/walk_test.go
+++ b/tools/compliance/policy/walk_test.go
@@ -620,7 +620,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			expectedRs := toResolutionSet(lg, tt.expectedResolutions)
@@ -1228,7 +1228,7 @@
 			stderr := &bytes.Buffer{}
 			lg, err := toGraph(stderr, tt.roots, tt.edges)
 			if err != nil {
-				t.Errorf("unexpected test data error: got %w, want no error", err)
+				t.Errorf("unexpected test data error: got %s, want no error", err)
 				return
 			}
 			expectedAs := toActionSet(lg, tt.expectedActions)