[media] gspca_finepix: Remove unnecessary lock/unlock call

gspca_main: init_transfer does not do anything between calling sd_start
(which starts the workqueue) and releasing the usb_lock, so this
synchronization is a nop, remove it.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/usb/gspca/finepix.c

@@ -87,9 +87,6 @@ static void dostream(struct work_struct *work)
 	int ret = 0;
 	int len;
 
-	/* synchronize with the main driver */
-	mutex_lock(&gspca_dev->usb_lock);
-	mutex_unlock(&gspca_dev->usb_lock);
 	PDEBUG(D_STREAM, "dostream started");
 
 	/* loop reading a frame */