fix: remove double close

Signed-off-by: Christoph MEIER <meier-christoph@users.noreply.github.com>

pkg/vendir/fetch/http/sync.go

@@ -38,11 +38,11 @@ func (t *Sync) Sync(dstPath string, tempArea ctlfetch.TempArea) (ctlconf.LockDir
 		return lockConf, err
 	}
 
-	defer tmpFile.Close()
 	defer os.Remove(tmpFile.Name())
 
 	err = t.downloadFileAndChecksum(tmpFile)
 	if err != nil {
+		tmpFile.Close()
 		return lockConf, fmt.Errorf("Downloading URL: %s", err)
 	}