go/internal/gccimporter: actually use pkg parameter

We're passed a pkg, so it makes little sense to not use it. This was
probably a typo and not the intended behaviour.

Fixes #19407.

Change-Id: Ia1c9130c0e474daf47753cf51914a2d7db272c96
Reviewed-on: https://go-review.googlesource.com/37839Reviewed-by: Robert Griesemer <gri@golang.org>

src/go/internal/gccgoimporter/parser.go

@@ -739,7 +739,7 @@ func (p *parser) discardDirectiveWhileParsingTypes(pkg *types.Package) {
 		case ';':
 			return
 		case '<':
-			p.parseType(p.pkg)
+			p.parseType(pkg)
 		case scanner.EOF:
 			p.error("unexpected EOF")
 		default: