gofmt: gofmt test harness bug fix

Don't use the rewrite rule from a previous test
for the next test if there is no rewrite rule
provided.

R=r, r2
CC=golang-dev
https://golang.org/cl/4419045

diff --git a/src/cmd/gofmt/rewrite.go b/src/cmd/gofmt/rewrite.go
index 631c513310ca49285331ee6dc1a0cdab60039e2b..47d1ac46ce0b4da9b1b1ce9401ca9e786bd7fda0 100644 (file)
--- a/src/cmd/gofmt/rewrite.go
+++ b/src/cmd/gofmt/rewrite.go
@@ -19,6 +19,7 @@ import (
 
 func initRewrite() {
        if *rewriteRule == "" {
+               rewrite = nil // disable any previous rewrite
                return
        }
        f := strings.Split(*rewriteRule, "->", -1)