Update wrapped error while returning FileClobberedError after calling…

… clobbered method (#2885)

* Update wrapped error in FileClobberedError

* handled nil error explicitly

* executing checking err for not nil before clobbered check

* refactored code according to go style guide

* minor fix

* fixed formatting

internal/fs/inode/file.go

@@ -726,13 +726,15 @@ func (f *FileInode) fetchLatestGcsObject(ctx context.Context) (*gcs.Object, erro
 	// default sets the projection to full, which fetches all the object
 	// properties.
 	latestGcsObj, isClobbered, err := f.clobbered(ctx, true, true)
+	if err != nil {
+		return nil, err
+	}
 	if isClobbered {
-		err = &gcsfuse_errors.FileClobberedError{
-			Err: err,
+		return nil, &gcsfuse_errors.FileClobberedError{
+			Err: fmt.Errorf("file was clobbered"),
 		}
 	}
-
-	return latestGcsObj, err
+	return latestGcsObj, nil
 }
 
 // Sync writes out contents to GCS.  If this fails due to the generation