Make htmlGzNotice an internal variable instead of apexBundle field.

It's not read outside of the function / action generation logic, so keep
it inside the function.

Test: presubmits
Fixes: 190817312
Change-Id: I0626e6c86adc584abb2a251cbc7ffb1bec2c7f59
diff --git a/apex/builder.go b/apex/builder.go
index e4c1673..9e368b6 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -650,9 +650,9 @@
 		}
 
 		// Create a NOTICE file, and embed it as an asset file in the APEX.
-		a.htmlGzNotice = android.PathForModuleOut(ctx, "NOTICE.html.gz")
+		htmlGzNotice := android.PathForModuleOut(ctx, "NOTICE.html.gz")
 		android.BuildNoticeHtmlOutputFromLicenseMetadata(
-			ctx, a.htmlGzNotice, "", "",
+			ctx, htmlGzNotice, "", "",
 			[]string{
 				android.PathForModuleInstall(ctx).String() + "/",
 				android.PathForModuleInPartitionInstall(ctx, "apex").String() + "/",
@@ -660,7 +660,7 @@
 		noticeAssetPath := android.PathForModuleOut(ctx, "NOTICE", "NOTICE.html.gz")
 		builder := android.NewRuleBuilder(pctx, ctx)
 		builder.Command().Text("cp").
-			Input(a.htmlGzNotice).
+			Input(htmlGzNotice).
 			Output(noticeAssetPath)
 		builder.Build("notice_dir", "Building notice dir")
 		implicitInputs = append(implicitInputs, noticeAssetPath)