media: usbvision: remove time_in_irq

Time "in interrupt" accounting with the help of `jiffies' is a pointless
exercise. This variable isn't even used.
Remove time_in_irq.

Cc: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/usb/usbvision/usbvision-core.c

@@ -1272,7 +1272,6 @@ static void usbvision_isoc_irq(struct urb *urb)
 	int len;
 	struct usb_usbvision *usbvision = urb->context;
 	int i;
-	unsigned long start_time = jiffies;
 	struct usbvision_frame **f;
 
 	/* We don't want to do anything if we are about to be removed! */
@@ -1324,8 +1323,6 @@ static void usbvision_isoc_irq(struct urb *urb)
 		scratch_reset(usbvision);
 	}
 
-	usbvision->time_in_irq += jiffies - start_time;
-
 	for (i = 0; i < USBVISION_URB_FRAMES; i++) {
 		urb->iso_frame_desc[i].status = 0;
 		urb->iso_frame_desc[i].actual_length = 0;

drivers/media/usb/usbvision/usbvision.h

@@ -447,7 +447,6 @@ struct usb_usbvision {
 	unsigned long isoc_skip_count;			/* How many empty ISO packets received */
 	unsigned long isoc_err_count;			/* How many bad ISO packets received */
 	unsigned long isoc_packet_count;		/* How many packets we totally got */
-	unsigned long time_in_irq;			/* How long do we need for interrupt */
 	int isoc_measure_bandwidth_count;
 	int frame_num;					/* How many video frames we send to user */
 	int max_strip_len;				/* How big is the biggest strip */