xfs: remove unnecessary int returns from deferred bmap functions

Remove the return value from the functions that schedule deferred bmap
operations since they never fail and do not return status.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 98c6a7a..e12f0ba 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1532,24 +1532,16 @@ xfs_swap_extent_rmap(
 			trace_xfs_swap_extent_rmap_remap_piece(tip, &uirec);
 
 			/* Remove the mapping from the donor file. */
-			error = xfs_bmap_unmap_extent(tp, tip, &uirec);
-			if (error)
-				goto out;
+			xfs_bmap_unmap_extent(tp, tip, &uirec);
 
 			/* Remove the mapping from the source file. */
-			error = xfs_bmap_unmap_extent(tp, ip, &irec);
-			if (error)
-				goto out;
+			xfs_bmap_unmap_extent(tp, ip, &irec);
 
 			/* Map the donor file's blocks into the source file. */
-			error = xfs_bmap_map_extent(tp, ip, &uirec);
-			if (error)
-				goto out;
+			xfs_bmap_map_extent(tp, ip, &uirec);
 
 			/* Map the source file's blocks into the donor file. */
-			error = xfs_bmap_map_extent(tp, tip, &irec);
-			if (error)
-				goto out;
+			xfs_bmap_map_extent(tp, tip, &irec);
 
 			error = xfs_defer_finish(tpp);
 			tp = *tpp;