staging: wilc1000: fix coding style of kmalloc usage

This patch fixes coding style of kmalloc usage found by checkpatch.
CHECK: Prefer kmalloc(sizeof(*new_msg)...) over kmalloc(sizeof(struct message)...)
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/wilc_msgqueue.c

@@ -70,7 +70,7 @@ int wilc_mq_send(struct message_queue *mq,
 	}
 
 	/* construct a new message */
-	new_msg = kmalloc(sizeof(struct message), GFP_ATOMIC);
+	new_msg = kmalloc(sizeof(*new_msg), GFP_ATOMIC);
 	if (!new_msg)
 		return -ENOMEM;