gpio: xilinx: Return 0 from xilinx_gpio_set_value
.set_value functions have no specified return value and gpio_uclass is not working with it too. But this patch is returning 0 to be in sync with others DM gpio drivers. Reported-by: NStefan Herbrechtsmeier <stefan@herbrechtsmeier.net> Signed-off-by: NMichal Simek <michal.simek@xilinx.com> Reviewed-by: NStefan Herbrechtsmeier <stefan@herbrechtsmeier.net>
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