p54: integrate parts of lmac_longbow.h and other parts of stlc45xx

This patch removes most/all? of the "magic" numbers and unknown structure
variables inside the code and replaces them with meaningful prototypes.

(Plus a one line warning fix from Larry Finger <Larry.Finger@lwfinger.net>.)

Signed-off-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/p54/p54usb.c b/drivers/net/wireless/p54/p54usb.c
index 88fb650..49739c3 100644
--- a/drivers/net/wireless/p54/p54usb.c
+++ b/drivers/net/wireless/p54/p54usb.c
@@ -230,7 +230,7 @@
 
 	usb_fill_bulk_urb(addr_urb, priv->udev,
 			  usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
-			  &((struct p54_control_hdr *)skb->data)->req_id, 4,
+			  &((struct p54_hdr *)skb->data)->req_id, 4,
 			  p54u_tx_cb, dev);
 	usb_fill_bulk_urb(data_urb, priv->udev,
 			  usb_sndbulkpipe(priv->udev, P54U_PIPE_DATA),
@@ -262,7 +262,7 @@
 	struct urb *data_urb;
 	struct lm87_tx_hdr *hdr;
 	__le32 checksum;
-	__le32 addr = ((struct p54_control_hdr *)skb->data)->req_id;
+	__le32 addr = ((struct p54_hdr *)skb->data)->req_id;
 
 	data_urb = usb_alloc_urb(0, GFP_ATOMIC);
 	if (!data_urb)
@@ -313,8 +313,8 @@
 
 	hdr = (void *)skb_push(skb, sizeof(*hdr));
 	memset(hdr, 0, sizeof(*hdr));
-	hdr->device_addr = ((struct p54_control_hdr *)skb->data)->req_id;
-	hdr->len = cpu_to_le16(skb->len + sizeof(struct p54_control_hdr));
+	hdr->device_addr = ((struct p54_hdr *)skb->data)->req_id;
+	hdr->len = cpu_to_le16(skb->len + sizeof(struct p54_hdr));
 
 	usb_fill_bulk_urb(int_urb, priv->udev,
 		usb_sndbulkpipe(priv->udev, P54U_PIPE_DEV), reg, sizeof(*reg),