gpio: Prevent an integer overflow in the pca953x driver
Interrupts were missed if an 8-bit integer overflow occurred. This was observed when bank0,pin7 and bank1,pin7 changed simultaniously. As the 8-bit totals were only checked against zero, replace them with booleans. Name the booleans so that their purpose is clear. Signed-off-by: NJoshua Scott <joshua.scott@alliedtelesis.co.nz> Reviewed-by: NAlexandre Courbot <acourbot@nvidia.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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