gpio: sim: fix a memory leak

Fix an inverted logic bug in gpio_sim_remove_hogs() that leads to GPIO
hog structures never being freed.

Fixes: cb8c474 ("gpio: sim: new testing module")
Reported-by: Mirsad Goran Todorovac <mirsad.todorovac@alu.unizg.hr>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Author: Bartosz Golaszewski

drivers/gpio/gpio-sim.c

@@ -736,7 +736,7 @@ static void gpio_sim_remove_hogs(struct gpio_sim_device *dev)
 
 	gpiod_remove_hogs(dev->hogs);
 
-	for (hog = dev->hogs; !hog->chip_label; hog++) {
+	for (hog = dev->hogs; hog->chip_label; hog++) {
 		kfree(hog->chip_label);
 		kfree(hog->line_name);
 	}