msm: mdss: Prevent zero backlight from been sent to AD core
Sending zero backlight to AD core will cause a divided by zero
case, which should be avoided. This change adds a check to
prevent zero backlight from been sent to AD core.
CRs-Fixed: 985303
Change-Id: Ida5115edc61dea9855be89186af3faae040fd711
Signed-off-by:
Ping Li <pingli@codeaurora.org>
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