msm-camera: Add mutex unlock during get event payload ioctl.

Adding mutex unlock in get event pay load ioctl when index
parameters are outof bounds.

CRs-Fixed: 598557
Change-Id: If1a549edc393105578c13340dab486d576786d76
Signed-off-by: Katta Santhisindhu <kattas@codeaurora.org>
msm: kgsl: Handle failure of find_process_private()

Handle the case of NULL return from find_process_private() upon
its failure by failing from get_process_private().

CRs-fixed: 542831
Change-Id: I8a365368ecf68f0d1aa01199aca76bc7ac49e154
Signed-off-by: Harsh Vardhan Dwivedi <hdwivedi@codeaurora.org>
Merge "msm-camera: Add mutex unlock during get event payload ioctl."
Merge "msm: kgsl: Handle failure of find_process_private()"