[PATCH] pcnet32: fix boundary comparison bug.

This patch fixes a boundary condition.  It is possible to get an
interrupt and have the transmit queue completely full.  Without this
the driver will leak skb's and pci maps (if the arch supports them).

drivers/net/pcnet32.c

@@ -1833,7 +1833,7 @@ pcnet32_interrupt(int irq, void *dev_id, struct pt_regs * regs)
 	    }
 
 	    delta = (lp->cur_tx - dirty_tx) & (TX_RING_MOD_MASK + TX_RING_SIZE);
-	    if (delta >= TX_RING_SIZE) {
+	    if (delta > TX_RING_SIZE) {
 		if (netif_msg_drv(lp))
 		    printk(KERN_ERR "%s: out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
 			    dev->name, dirty_tx, lp->cur_tx, lp->tx_full);