cmd/compile/internal/parser: removed TODO (cleanup)

When an opening "{" of a block is missing and after advancing we
find a closing "}", it's likely better to assume the end of the
block. Fixed and removed TODO.

Change-Id: I20c9b4ecca798933a7cd4cbf21185bd4ca04f5f7
Reviewed-on: https://go-review.googlesource.com/71291Reviewed-by: Matthew Dempsky <mdempsky@google.com>

src/cmd/compile/internal/syntax/parser.go

@@ -1689,10 +1689,14 @@ func (p *parser) blockStmt(context string) *BlockStmt {
 	s := new(BlockStmt)
 	s.pos = p.pos()
 
+	// people coming from C may forget that braces are mandatory in Go
 	if !p.got(_Lbrace) {
 		p.syntax_error("expecting { after " + context)
 		p.advance(_Name, _Rbrace)
-		// TODO(gri) may be better to return here than to continue (#19663)
+		s.Rbrace = p.pos() // in case we found "}"
+		if p.got(_Rbrace) {
+			return s
+		}
 	}
 
 	s.List = p.stmtList()