hw/gpio/imx_gpio: Fix interpretation of GDIR polarity

According to the i.MX 8M Plus reference manual, a GPIO pin is
configured as an output when the corresponding bit in the GDIR
register is set.  The function imx_gpio_set_int_line() is intended to
be a no-op if the pin is configured as an output, returning early in
such cases.  However, it inverts the condition.  Fix this by
returning early when the bit is set.

cc: [email protected]
Fixes: f442728 ("i.MX: Add GPIO device")
Signed-off-by: Bernhard Beschow <[email protected]>
Message-id: [email protected]
Reviewed-by: Peter Maydell <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>
(cherry picked from commit eba837a)
Signed-off-by: Michael Tokarev <[email protected]>

Author: shentok

hw/gpio/imx_gpio.c

@@ -72,7 +72,7 @@ static void imx_gpio_update_int(IMXGPIOState *s)
 static void imx_gpio_set_int_line(IMXGPIOState *s, int line, IMXGPIOLevel level)
 {
     /* if this signal isn't configured as an input signal, nothing to do */
-    if (!extract32(s->gdir, line, 1)) {
+    if (extract32(s->gdir, line, 1)) {
         return;
     }