3e95019a1c
This function was used by pin_request() to pointlessly double-check
the pin validity, and it was the only user ever.
Since commit d2f6a1c6fb0e ("pinctrl: remove double pin validity
check."), no one has ever used it.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>