msm: kgsl: Properly handle an empty ringbuffer
The code seeking out the failing frame for a hang got confused if
the CP read and write pointers were equal resulting in missing
IBs.
Change-Id: Ic0dedbadb32e4a708d0f8ee9e8a853fdfaff10b0
Signed-off-by:
Jordan Crouse <jcrouse@codeaurora.org>
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