pinctrl: core: take into account the pins array in pinctrl_pins_show()

pinctrl: core: take into account the pins array in pinctrl_pins_show()

We previously only looked at the 'pin_base' of the pinctrl_gpio_ranges
struct for determining if a pin matched a GPIO number.

This value is present only if the 'pins' array is not NULL,
and is 0 otherwise. This means that GPIO ranges declared using
gpiochip_add_pingroup_range(), thus making use of pins, were always matched
by the pins in the range [0-npins] even if they contained pins in a
completely separate range.

Signed-off-by: Léo DUBOIN <lduboin@freebox.fr>
Link: https://lore.kernel.org/r/6df39bd47942156be5713f8f4e317d2ad3e0ddeb.1714049455.git.lduboin@freebox.fr
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>