From 57a5a882031dba5cb7bc7ebc955b897498365fe2 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 30 Jul 2012 02:15:43 -0600
Subject: [PATCH] Btrfs: checking for NULL instead of IS_ERR

add_qgroup_rb() never returns NULL, only error pointers.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
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