media: i2c: ov2740: Drop check for reentrant .s_stream()

The subdev .s_stream() operation shall not be called to start streaming
on an already started subdev, or stop streaming on a stopped subdev.
Remove the check that guards against that condition.

Signed-off-by: Laurent Pinchart <[e-mail]>
Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Hans Verkuil <[e-mail]>

drivers/media/i2c/ov2740.c

···
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int ret = 0;
 
-	if (ov2740->streaming == enable)
-		return 0;
-
 	mutex_lock(&ov2740->mutex);
 	if (enable) {
 		ret = pm_runtime_resume_and_get(&client->dev);