leds: pwm: check result of led_pwm_set() in led_pwm_add()

led_pwm_set() now returns an error when setting the PWM fails.

Signed-off-by: Denis Osterland-Heim <Denis.Osterland@diehl.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
1 file changed