net: af_packet: use setup_timer() helper.

Use setup_timer function instead of initializing timer with the
function and data fields.
Signed-off-by: Allen Pais <allen.lkml@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/packet/af_packet.c

@@ -544,9 +544,7 @@ static void prb_init_blk_timer(struct packet_sock *po,
 		struct tpacket_kbdq_core *pkc,
 		void (*func) (unsigned long))
 {
-	init_timer(&pkc->retire_blk_timer);
-	pkc->retire_blk_timer.data = (long)po;
-	pkc->retire_blk_timer.function = func;
+	setup_timer(&pkc->retire_blk_timer, func, (long)po);
 	pkc->retire_blk_timer.expires = jiffies;
 }