iwlegacy: Use kcalloc instead of kzalloc to allocate array

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlegacy/common.c

@@ -2786,9 +2786,8 @@ il_tx_queue_alloc(struct il_priv *il, struct il_tx_queue *txq, u32 id)
 	/* Driver ilate data, only for Tx (not command) queues,
 	 * not shared with device. */
 	if (id != il->cmd_queue) {
-		txq->txb =
-		    kzalloc(sizeof(txq->txb[0]) * TFD_QUEUE_SIZE_MAX,
-			    GFP_KERNEL);
+		txq->txb = kcalloc(TFD_QUEUE_SIZE_MAX, sizeof(txq->txb[0]),
+				   GFP_KERNEL);
 		if (!txq->txb) {
 			IL_ERR("kmalloc for auxiliary BD "
 			       "structures failed\n");