media: i2c: ov5695: 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.

The streaming field of the driver's private structure is now unused,
drop it as well.

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

drivers/media/i2c/ov5695.c

···
 	struct v4l2_ctrl	*vblank;
 	struct v4l2_ctrl	*test_pattern;
 	struct mutex		mutex;
-	bool			streaming;
 	const struct ov5695_mode *cur_mode;
 };
 
···
 	int ret = 0;
 
 	mutex_lock(&ov5695->mutex);
-	on = !!on;
-	if (on == ov5695->streaming)
-		goto unlock_and_return;
 
 	if (on) {
 		ret = pm_runtime_resume_and_get(&client->dev);
···
 		__ov5695_stop_stream(ov5695);
 		pm_runtime_put(&client->dev);
 	}
-
-	ov5695->streaming = on;
 
 unlock_and_return:
 	mutex_unlock(&ov5695->mutex);