IXP4xx: Change QMgr function names to qmgr_stat_*_watermark and clean the comments.

Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
diff --git a/drivers/net/wan/ixp4xx_hss.c b/drivers/net/wan/ixp4xx_hss.c
index 1e56e58..a6dc317 100644
--- a/drivers/net/wan/ixp4xx_hss.c
+++ b/drivers/net/wan/ixp4xx_hss.c
@@ -790,11 +790,10 @@
 		free_buffer_irq(port->tx_buff_tab[n_desc]);
 		port->tx_buff_tab[n_desc] = NULL;
 
-		/* really empty in fact */
-		start = qmgr_stat_nearly_empty(port->plat->txreadyq);
+		start = qmgr_stat_below_low_watermark(port->plat->txreadyq);
 		queue_put_desc(port->plat->txreadyq,
 			       tx_desc_phys(port, n_desc), desc);
-		if (start) {
+		if (start) { /* TX-ready queue was empty */
 #if DEBUG_TX
 			printk(KERN_DEBUG "%s: hss_hdlc_txdone_irq xmit"
 			       " ready\n", dev->name);
@@ -869,13 +868,13 @@
 	queue_put_desc(queue_ids[port->id].tx, tx_desc_phys(port, n), desc);
 	dev->trans_start = jiffies;
 
-	if (qmgr_stat_nearly_empty(txreadyq)) { /* really empty in fact */
+	if (qmgr_stat_below_low_watermark(txreadyq)) { /* empty */
 #if DEBUG_TX
 		printk(KERN_DEBUG "%s: hss_hdlc_xmit queue full\n", dev->name);
 #endif
 		netif_stop_queue(dev);
 		/* we could miss TX ready interrupt */
-		if (!qmgr_stat_nearly_empty(txreadyq)) {
+		if (!qmgr_stat_below_low_watermark(txreadyq)) {
 #if DEBUG_TX
 			printk(KERN_DEBUG "%s: hss_hdlc_xmit ready again\n",
 			       dev->name);