msm_fb : Check the validity of Histogram start/stop ioctls.
Histogram start/stop ioctls are called now without checking
if the panel is on or not. Add check to validate the ioctl
calls in this aspect.
CRs-fixed: 327910
Change-Id: Idc110408841c1b813dd2331a63cafe80243baeac
Signed-off-by:
Padmanabhan Komanduru <pkomandu@codeaurora.org>
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