gpio: mockup: Drop duplicate NULL check in gpio_mockup_unregister_pdevs()

Since platform_device_unregister() is NULL-aware, we don't need to duplicate
this check. Remove it and fold the rest of the code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

drivers/gpio/gpio-mockup.c

@@ -479,15 +479,10 @@ static struct platform_device *gpio_mockup_pdevs[GPIO_MOCKUP_MAX_GC];
 
 static void gpio_mockup_unregister_pdevs(void)
 {
-	struct platform_device *pdev;
 	int i;
 
-	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++) {
-		pdev = gpio_mockup_pdevs[i];
-
-		if (pdev)
-			platform_device_unregister(pdev);
-	}
+	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++)
+		platform_device_unregister(gpio_mockup_pdevs[i]);
 }
 
 static __init char **gpio_mockup_make_line_names(const char *label,