From ae994ea972473c0ace9d55f718b60f0727af1381 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Sat, 20 Jun 2015 10:26:50 -0600
Subject: [PATCH] cfq-iosched: fix other locations where blkcg_to_cfqgd() can
 return NULL

Commit 9470e4a693db only covered the initial bug report, there are
other spots in CFQ where we need to check that we actually have
a valid cfq_group_data structure.

Fixes: e48453c3 ("block, cgroup: implement policy-specific per-blkcg data")
Signed-off-by: Jens Axboe <axboe@fb.com>
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