drivers/net: Remove unnecessary k.alloc/v.alloc OOM messages

alloc failures use dump_stack so emitting an additional
out-of-memory message is an unnecessary duplication.

Remove the allocation failure messages.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 59effac..2596401 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1639,10 +1639,8 @@
 
 	xen_netbk_group_nr = num_online_cpus();
 	xen_netbk = vzalloc(sizeof(struct xen_netbk) * xen_netbk_group_nr);
-	if (!xen_netbk) {
-		printk(KERN_ALERT "%s: out of memory\n", __func__);
+	if (!xen_netbk)
 		return -ENOMEM;
-	}
 
 	for (group = 0; group < xen_netbk_group_nr; group++) {
 		struct xen_netbk *netbk = &xen_netbk[group];