pinctrl: samsung: Make samsung_pinctrl_get_soc_data use ERR_PTR()

Currently the function returns a valid pointer on success and NULL on
error, so exact error code is lost. This patch changes return convention
of the function to use ERR_PTR() on error instead.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>

diff --cc drivers/pinctrl/samsung/pinctrl-samsung.c
Simple merge