affs: d_obtain_alias(ERR_PTR(...)) will do the right thing

Signed-off-by: Al Viro <[e-mail]>

fs/affs/namei.c

···
 	parent = affs_iget(child->d_sb,
 			   be32_to_cpu(AFFS_TAIL(child->d_sb, bh)->parent));
 	brelse(bh);
-	if (IS_ERR(parent))
-		return ERR_CAST(parent);
-
 	return d_obtain_alias(parent);
 }