[media] smiapp: Drop BUG_ON() in suspend path

Checking that the mutex is not acquired is unnecessary for user processes
are stopped by this point. Drop the check.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/smiapp/smiapp-core.c

@@ -2709,8 +2709,6 @@ static int smiapp_suspend(struct device *dev)
 	struct smiapp_sensor *sensor = to_smiapp_sensor(subdev);
 	bool streaming;
 
-	BUG_ON(mutex_is_locked(&sensor->mutex));
-
 	if (sensor->power_count == 0)
 		return 0;