md/raid5: Use correct IS_ERR() variation on pointer check

This fixes a build error on certain architectures, such as ppc64.

Fixes: 6995f0b2("md: takeover should clear unrelated bits")
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Shaohua Li <shli@fb.com>

drivers/md/raid5.c

@@ -7831,7 +7831,7 @@ static void *raid5_takeover_raid1(struct mddev *mddev)
 	mddev->new_chunk_sectors = chunksect;
 
 	ret = setup_conf(mddev);
-	if (!IS_ERR_VALUE(ret))
+	if (!IS_ERR(ret))
 		mddev_clear_unsupported_flags(mddev,
 			UNSUPPORTED_MDDEV_FLAGS);
 	return ret;