mfd: tc6393xb: Use gpiochip data pointer
This makes the driver use the data pointer added to the gpio_chip to store a pointer to the state container instead of relying on container_of(). Cc: Dmitry Baryshkov <dbaryshkov@gmail.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NLee Jones <lee.jones@linaro.org>
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