gpio: pcf857x: Be sure to clamp return value

As we want gpio_chip .get() calls to be able to return negative
error codes and propagate to drivers, we need to go over all
drivers and make sure their return values are clamped to [0,1].
We do this by using the ret = !!(val) design pattern.

Also start returning the error code if something fails, as the
end of the series augment the core to support this.

Cc: Grygorii Strashko <[email protected]>
Cc: George Cherian <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>

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