linux-imx

Input: samsung-keypad - switch to using managed resources

devm_* functions are device managed and make error handling and code
simpler. While at it also fix error exit paths.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>