drivers:net: Remove unnecessary OOM messages after netdev_alloc_skb

Emitting netdev_alloc_skb and netdev_alloc_skb_ip_align OOM
messages is unnecessary as there is already a dump_stack
after allocation failures.

Other trivial changes around these removals:

Convert a few comparisons of pointer to 0 to !pointer.
Change flow to remove unnecessary label.
Remove now unused variable.
Hoist assignment from if.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
index 46df288..edc1200 100644
--- a/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
+++ b/drivers/net/ethernet/freescale/fs_enet/fs_enet-main.c
@@ -177,8 +177,6 @@
 				received++;
 				netif_receive_skb(skb);
 			} else {
-				dev_warn(fep->dev,
-					 "Memory squeeze, dropping packet.\n");
 				fep->stats.rx_dropped++;
 				skbn = skb;
 			}
@@ -309,8 +307,6 @@
 				received++;
 				netif_rx(skb);
 			} else {
-				dev_warn(fep->dev,
-					 "Memory squeeze, dropping packet.\n");
 				fep->stats.rx_dropped++;
 				skbn = skb;
 			}
@@ -505,11 +501,9 @@
 	 */
 	for (i = 0, bdp = fep->rx_bd_base; i < fep->rx_ring; i++, bdp++) {
 		skb = netdev_alloc_skb(dev, ENET_RX_FRSIZE);
-		if (skb == NULL) {
-			dev_warn(fep->dev,
-				 "Memory squeeze, unable to allocate skb\n");
+		if (skb == NULL)
 			break;
-		}
+
 		skb_align(skb, ENET_RX_ALIGN);
 		fep->rx_skbuff[i] = skb;
 		CBDW_BUFADDR(bdp,
@@ -593,13 +587,8 @@
 
 	/* Alloc new skb */
 	new_skb = netdev_alloc_skb(dev, skb->len + 4);
-	if (!new_skb) {
-		if (net_ratelimit()) {
-			dev_warn(fep->dev,
-				 "Memory squeeze, dropping tx packet.\n");
-		}
+	if (!new_skb)
 		return NULL;
-	}
 
 	/* Make sure new skb is properly aligned */
 	skb_align(new_skb, 4);