gpio: da9055: normalize return value of gpio_get

The GPIO get callback is expected to return 0 or 1 (or a negative error
code). Ensure that the value returned by da9055_gpio_get() is normalized
to the [0, 1] range.

Signed-off-by: Dmitry Torokhov <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-da9055.c

···
 			return ret;
 	}
 
-	return ret & (1 << offset);
+	return !!(ret & (1 << offset));
 
 }