gpio: tc3589x: fix up .get_direction()

The bit in the TC3589x direction register is 0 for input
and 1 for output, but the gpiolib expects the reverse.
Fix up the logic.

Cc: stable@vger.kernel.org
Fixes: 14063d71 ("gpio: tc3589x: add .get_direction() and small cleanup")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-tc3589x.c

@@ -97,7 +97,7 @@ static int tc3589x_gpio_get_direction(struct gpio_chip *chip,
 	if (ret < 0)
 		return ret;
 
-	return !!(ret & BIT(pos));
+	return !(ret & BIT(pos));
 }
 
 static int tc3589x_gpio_set_single_ended(struct gpio_chip *chip,