Description: blkcg: fix double free of new_blkg in blkcg_init_queue
References:
Notes:
 bwh> Introduced in 4.2-rc1 by commit ec13b1d6f0a0 "blkcg: always create
 bwh> the blkcg_gq for the root blkcg".
Bugs:
upstream: released (4.11-rc1) [9b54d816e00425c3a517514e0d677bb3cec49258]
4.9-upstream-stable: released (4.9.89) [7bd2d0c746f1fac2fb7f2ee972767cbc8be60962]
3.16-upstream-stable: N/A "Issue introduced later"
3.2-upstream-stable: N/A "Issue introduced later"
sid: released (4.11.6-1)
4.9-stretch-security: released (4.9.88-1) [bugfix/all/blkcg-fix-double-free-of-new_blkg-in-blkcg_init_queu.patch]
3.16-jessie-security: N/A "Issue introduced later"
3.2-wheezy-security: N/A "Issue introduced later"