Do not double close reader (#29354) (#29370)

Backport #29354 by @KN4CK3R

Fixes #29346

Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/repo/editor.go

@@ -161,9 +161,6 @@ func editFile(ctx *context.Context, isNewFile bool) {
 		}
 
 		d, _ := io.ReadAll(dataRc)
-		if err := dataRc.Close(); err != nil {
-			log.Error("Error whilst closing blob data: %v", err)
-		}
 
 		buf = append(buf, d...)
 		if content, err := charset.ToUTF8(buf, charset.ConvertOpts{KeepBOM: true}); err != nil {