Input: samsung-keypad - use guard notation to acquire mutex

Guard notation is more compact and ensures that the mutex will be
released when control leaves the function.

Reviewed-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Dmitry Torokhov <[email protected]>

Author: dtor

drivers/input/keyboard/samsung-keypad.c

@@ -510,15 +510,13 @@ static int samsung_keypad_suspend(struct device *dev)
 	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = keypad->input_dev;
 
-	mutex_lock(&input_dev->mutex);
+	guard(mutex)(&input_dev->mutex);
 
 	if (input_device_enabled(input_dev))
 		samsung_keypad_stop(keypad);
 
 	samsung_keypad_toggle_wakeup(keypad, true);
 
-	mutex_unlock(&input_dev->mutex);
-
 	return 0;
 }
 
@@ -528,15 +526,13 @@ static int samsung_keypad_resume(struct device *dev)
 	struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 	struct input_dev *input_dev = keypad->input_dev;
 
-	mutex_lock(&input_dev->mutex);
+	guard(mutex)(&input_dev->mutex);
 
 	samsung_keypad_toggle_wakeup(keypad, false);
 
 	if (input_device_enabled(input_dev))
 		samsung_keypad_start(keypad);
 
-	mutex_unlock(&input_dev->mutex);
-
 	return 0;
 }