pinctrl: pinmux: Remove duplicate error message in pin_request()

Detailed error message is already printed at the end of the function, so
drop redundant one a few lines earlier.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20230909063613.2867-2-jernej.skrabec@gmail.com


Signed-off-by: Linus Walleij <linus.walleij@linaro.org>