Fix `go vet` issues

Test: go vet ./...
Change-Id: Ifb936ccc5e2b5a2c3fcbbbcb54f680e2973ea1b3
diff --git a/cmd/multiproduct_kati/main.go b/cmd/multiproduct_kati/main.go
index 9fb400f..a6bc8d5 100644
--- a/cmd/multiproduct_kati/main.go
+++ b/cmd/multiproduct_kati/main.go
@@ -159,7 +159,7 @@
 		stat.Finish()
 	})
 
-	buildCtx := build.Context{&build.ContextImpl{
+	buildCtx := build.Context{ContextImpl: &build.ContextImpl{
 		Context: ctx,
 		Logger:  log,
 		Tracer:  trace,
@@ -297,7 +297,7 @@
 			productLog := logger.New(f)
 			productLog.SetOutput(filepath.Join(productLogDir, "soong.log"))
 
-			productCtx := build.Context{&build.ContextImpl{
+			productCtx := build.Context{ContextImpl: &build.ContextImpl{
 				Context: ctx,
 				Logger:  productLog,
 				Tracer:  trace,