cmd/go/internal/vcweb: close the .access file

For #71112

Change-Id: Ifda4fc8de148c42a2154da54b53d7215b9a6faa0
Reviewed-on: https://go-review.googlesource.com/c/go/+/640175
LUCI-TryBot-Result: Go LUCI <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Michael Matloob <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: ianlancetaylor

src/cmd/go/internal/vcweb/auth.go

@@ -63,6 +63,7 @@ func (h *authHandler) Handler(dir string, env []string, logger *log.Logger) (htt
 			var err error
 			accessFile, err = fs.Open(path.Join(accessDir, ".access"))
 			if err == nil {
+				defer accessFile.Close()
 				break
 			}