linux-phytec-ti

pinctrl: Fix potential memory leak in pinctrl_register_one_pin()

'pindesc' was not freed when returning from an error induced
exit path.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>