xfs: Propagate errors from xfs_reflink_cancel_cow_range in xfs_dax_write_iomap_end

In xfs_dax_write_iomap_end(), directly return the result of
xfs_reflink_cancel_cow_range() when !written, ensuring proper
error propagation and improving code robustness.

Fixes: ea6c49b ("xfs: support CoW in fsdax mode")
Cc: [email protected] # v6.0
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Wentao Liang <[email protected]>
Signed-off-by: Carlos Maiolino <[email protected]>

Author: ISCAS-Vulab

fs/xfs/xfs_iomap.c

@@ -976,10 +976,8 @@ xfs_dax_write_iomap_end(
 	if (!xfs_is_cow_inode(ip))
 		return 0;
 
-	if (!written) {
-		xfs_reflink_cancel_cow_range(ip, pos, length, true);
-		return 0;
-	}
+	if (!written)
+		return xfs_reflink_cancel_cow_range(ip, pos, length, true);
 
 	return xfs_reflink_end_cow(ip, pos, written);
 }