fixed linting isssues in fs.go with gofmt -e -d -s

fs.go

@@ -1233,11 +1233,11 @@ func (h *fsHandler) openIndexFile(ctx *RequestCtx, dirPath string, mustCompress
 		if err == nil {
 			return ff, nil
 		}
-        if mustCompress && err == errNoCreatePermission {
+		if mustCompress && err == errNoCreatePermission {
 			ctx.Logger().Printf("insufficient permissions for saving compressed file for %q. Serving uncompressed file. "+
 				"Allow write access to the directory with this file in order to improve fasthttp performance", indexFilePath)
 			mustCompress = false
-			return  h.openFSFile(indexFilePath, mustCompress, fileEncoding)
+			return h.openFSFile(indexFilePath, mustCompress, fileEncoding)
 		}
 		if !errors.Is(err, fs.ErrNotExist) {
 			return nil, fmt.Errorf("cannot open file %q: %w", indexFilePath, err)