UPSTREAM: regulator: pwm: Prints error number along with detail

UPSTREAM: regulator: pwm: Prints error number along with detail

Prints the error number along with error message when any
error occurs. This help on getting the reason of failure
quickly from log without any code instrument.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Cc: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 5bf59bd5e9a5b262110df8c1ea5ad8820d7d524a)

Change-Id: If370a4b4b44064ef978bd3b0b6d172e0259a5843
Signed-off-by: David Wu <david.wu@rock-chips.com>