[media] cx88: don't use atomic_t for core->users

users is always read or written with core->lock held. A plain int is
simpler and faster.

Tested-by: Andi Huber <[e-mail]>
Tested-by: Marlon de Boer <[e-mail]>
Signed-off-by: Jonathan Nieder <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/cx88/cx88-video.c

···
 		call_all(core, tuner, s_radio);
 	}
 
-	atomic_inc(&core->users);
+	core->users++;
 	mutex_unlock(&core->lock);
 
 	return 0;
···
 	file->private_data = NULL;
 	kfree(fh);
 
-	if(atomic_dec_and_test(&dev->core->users))
+	dev->core->users--;
+	if (!dev->core->users)
 		call_all(dev->core, core, s_power, 0);
 	mutex_unlock(&dev->core->lock);
 

drivers/media/video/cx88/cx88.h

···
 	struct mutex               lock;
 	/* various v4l controls */
 	u32                        freq;
-	atomic_t		   users;
+	int                        users;
 	int                        mpeg_users;
 
 	/* cx88-video needs to access cx8802 for hybrid tuner pll access. */