msm: kgsl: Only reference the rb_node after taking spinlock
Derefernce the rb node after taking spinlock since the root
node can change and is supposed to be guarded by the spinlock
CRs-Fixed: 495129
Change-Id: I63de7755cf9d5fb548c082f43403000bcef5721b
Signed-off-by:
Shubhraprakash Das <sadas@codeaurora.org>
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