firestream compile fix

drivers/atm/firestream.c

@@ -814,7 +814,7 @@ static void process_incoming (struct fs_dev *dev, struct queue *q)
 				skb_put (skb, qe->p1 & 0xffff); 
 				ATM_SKB(skb)->vcc = atm_vcc;
 				atomic_inc(&atm_vcc->stats->rx);
-				skb->stamp = xtime;
+				do_gettimeofday(&skb->stamp);
 				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-skb: %p (pushed)\n", skb);
 				atm_vcc->push (atm_vcc, skb);
 				fs_dprintk (FS_DEBUG_ALLOC, "Free rec-d: %p\n", pe);