gpio: 104-idi-48: Fix missing spin_lock_init for ack_lock
Fixes: 9ae48210 ("gpio: 104-idi-48: Clear pending interrupt once in IRQ handler") Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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