cifs: use PTR_ERR_OR_ZERO() to simplify code

PTR_ERR_OR_ZERO contains if(IS_ERR(...)) + PTR_ERR, just use
PTR_ERR_OR_ZERO directly.
Signed-off-by: NChen Zhou <chenzhou10@huawei.com>
Signed-off-by: NSteve French <stfrench@microsoft.com>
Reviewed-by: NPaulo Alcantara (SUSE) <pc@cjr.nz>

fs/cifs/dfs_cache.c

@@ -661,7 +661,7 @@ static int __dfs_cache_find(const unsigned int xid, struct cifs_ses *ses,
 	 */
 	if (noreq) {
 		up_read(&htable_rw_lock);
-		return IS_ERR(ce) ? PTR_ERR(ce) : 0;
+		return PTR_ERR_OR_ZERO(ce);
 	}
 
 	if (!IS_ERR(ce)) {