staging: wilc1000: fixes a struct allocation to match coding standards

This patch fixes the checks reported by checkpatch.pl
for prefer kmalloc(sizeof(*tx_data)...) over kmalloc(sizeof(struct tx_complete_data)...)
Signed-off-by: Leo Kim <leo.kim@atmel.com>
Signed-off-by: Glen Lee <glen.lee@atmel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/linux_wlan.c

@@ -1236,7 +1236,7 @@ int mac_xmit(struct sk_buff *skb, struct net_device *ndev)
 		return 0;
 	}
 
-	tx_data = kmalloc(sizeof(struct tx_complete_data), GFP_ATOMIC);
+	tx_data = kmalloc(sizeof(*tx_data), GFP_ATOMIC);
 	if (!tx_data) {
 		PRINT_ER("Failed to allocate memory for tx_data structure\n");
 		dev_kfree_skb(skb);