xfs: Remove redundant NULL check after __GFP_NOFAIL

kzalloc() is called with __GFP_NOFAIL, so a NULL return is not expected.
Drop the redundant !map check in xfs_dabuf_map().
Also switch the nirecs-sized allocation to kcalloc().

Signed-off-by: hongao <hongao@uniontech.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: hongaoo

fs/xfs/libxfs/xfs_da_btree.c

@@ -2716,12 +2716,8 @@ xfs_dabuf_map(
 	 * larger one that needs to be free by the caller.
 	 */
 	if (nirecs > 1) {
-		map = kzalloc(nirecs * sizeof(struct xfs_buf_map),
-				GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
-		if (!map) {
-			error = -ENOMEM;
-			goto out_free_irecs;
-		}
+		map = kcalloc(nirecs, sizeof(struct xfs_buf_map),
+			      GFP_KERNEL | __GFP_NOLOCKDEP | __GFP_NOFAIL);
 		*mapp = map;
 	}