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

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

Fixes: 6995f0b247e("md: takeover should clear unrelated bits")
Signed-off-by: Jes Sorensen <[e-mail]>
Signed-off-by: Shaohua Li <[e-mail]>

drivers/md/raid5.c

···
 	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;