drivers/net: Convert unbounded kzalloc calls to kcalloc

These changes may be slightly safer in some instances.

There are other kzalloc calls with a multiply, but those
calls are typically "small fixed #" * sizeof(some pointer)"
and those are not converted.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Acked-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index bc695d5..b4cc61f 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -4504,7 +4504,7 @@
 
 	np->dev->real_num_tx_queues = np->num_tx_rings;
 
-	np->rx_rings = kzalloc(np->num_rx_rings * sizeof(struct rx_ring_info),
+	np->rx_rings = kcalloc(np->num_rx_rings, sizeof(struct rx_ring_info),
 			       GFP_KERNEL);
 	err = -ENOMEM;
 	if (!np->rx_rings)
@@ -4538,7 +4538,7 @@
 			return err;
 	}
 
-	np->tx_rings = kzalloc(np->num_tx_rings * sizeof(struct tx_ring_info),
+	np->tx_rings = kcalloc(np->num_tx_rings, sizeof(struct tx_ring_info),
 			       GFP_KERNEL);
 	err = -ENOMEM;
 	if (!np->tx_rings)