[media] DaVinci-VPIF-Display: Delete an unnecessary variable initialisation in vpif_channel_isr()

The local variable "channel_id" will be reassigned with the following
statement at the beginning. Thus omit the explicit initialisation.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/davinci/vpif_display.c

@@ -363,7 +363,7 @@ static irqreturn_t vpif_channel_isr(int irq, void *dev_id)
 	struct channel_obj *ch;
 	struct common_obj *common;
 	int fid = -1, i;
-	int channel_id = 0;
+	int channel_id;
 
 	channel_id = *(int *)(dev_id);
 	if (!vpif_intr_status(channel_id + 2))