xfs: xfs_qm: remove unnecessary ‘0’ values from error

error is assigned first, so it does not need to initialize the
assignment.
Signed-off-by: NLi zeming <zeming@nfschina.com>
Reviewed-by: NDarrick J. Wong <djwong@kernel.org>
Signed-off-by: NDarrick J. Wong <djwong@kernel.org>

fs/xfs/xfs_qm.c

@@ -68,7 +68,7 @@ xfs_qm_dquot_walk(
 
 	while (1) {
 		struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
-		int		error = 0;
+		int		error;
 		int		i;
 
 		mutex_lock(&qi->qi_tree_lock);