[PATCH 4.9 070/104] backlight: pwm_bl: Fix overflow condition

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Derek Basehore [ Upstream commit 5d0c49acebc9488e37db95f1d4a55644e545ffe7 ] This fixes an overflow condition that can happen with high max brightness and period values

[PATCH 4.9 070/104] backlight: pwm_bl: Fix overflow condition

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Derek Basehore [ Upstream commit 5d0c49acebc9488e37db95f1d4a55644e545ffe7 ] This fixes an overflow condition that can happen with high max brightness and period values in compute_duty_cycle.