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gpiolib: Switch to for_each_set_bit()
The macro for_each_set_bit() effectively looks up to the next
set bit in array of bits.
Instead of open coding that switch to for_each_set_bit() in
gpio_chip_set_multiple().
While here, make gpio_chip_set_multiple() non-destructive
against its parameters. We are safe since all callers, i.e.
gpiod_set_array_value_complex(), handle that already.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>