gfs2: d_obtain_alias(ERR_PTR(...)) will do the right thing

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/export.c

@@ -138,8 +138,6 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb,
 		return ERR_PTR(-ESTALE);
 	inode = gfs2_lookup_by_inum(sdp, inum->no_addr, inum->no_formal_ino,
 				    GFS2_BLKST_DINODE);
-	if (IS_ERR(inode))
-		return ERR_CAST(inode);
 	return d_obtain_alias(inode);
 }