staging: r8188eu: remove ethernet.h header file

There are only two definitions from ethernet.h used in the driver.
Namely:

#define ETHERNET_HEADER_SIZE           14      /*  Ethernet Header Length */
#define LLC_HEADER_SIZE                6       /*  LLC Header Length */

Both are only used in the file core/rtw_recv.c. Replace the usage of
ETHERNET_HEADER_SIZE with ETH_HLEN, move the definition of LLC_HEADER_SIZE
into rtw_recv.h and remove the now unused ethernet.h header file.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210824123621.10801-4-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/core/rtw_recv.c

@@ -7,7 +7,6 @@
 #include "../include/drv_types.h"
 #include "../include/recv_osdep.h"
 #include "../include/mlme_osdep.h"
-#include "../include/ethernet.h"
 #include "../include/usb_ops.h"
 #include "../include/wifi.h"
 
@@ -1519,7 +1518,7 @@ static int amsdu_to_msdu(struct adapter *padapter, struct recv_frame *prframe)
 		/* Offset 12 denote 2 mac address */
 		nSubframe_Length = RTW_GET_BE16(pdata + 12);
 
-		if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
+		if (a_len < ETH_HLEN + nSubframe_Length) {
 			DBG_88E("nRemain_Length is %d and nSubframe_Length is : %d\n", a_len, nSubframe_Length);
 			goto exit;
 		}

drivers/staging/r8188eu/hal/rtl8188eu_recv.c

@@ -6,7 +6,6 @@
 #include "../include/drv_types.h"
 #include "../include/recv_osdep.h"
 #include "../include/mlme_osdep.h"
-#include "../include/ethernet.h"
 
 #include "../include/usb_ops.h"
 #include "../include/wifi.h"

drivers/staging/r8188eu/include/ethernet.h

@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
-/* Copyright(c) 2007 - 2011 Realtek Corporation. */
-
-#ifndef __INC_ETHERNET_H
-#define __INC_ETHERNET_H
-
-#define ETHERNET_ADDRESS_LENGTH		6	/*  Ethernet Address Length */
-#define ETHERNET_HEADER_SIZE		14	/*  Ethernet Header Length */
-#define LLC_HEADER_SIZE			6	/*  LLC Header Length */
-#define TYPE_LENGTH_FIELD_SIZE		2	/*  Type/Length Size */
-#define MINIMUM_ETHERNET_PACKET_SIZE	60	/*  Min Ethernet Packet Size */
-#define MAXIMUM_ETHERNET_PACKET_SIZE	1514	/*  Max Ethernet Packet Size */
-
-/*  Is Multicast Address? */
-#define RT_ETH_IS_MULTICAST(_addr)	((((u8 *)(_addr))[0]&0x01) != 0)
-#define RT_ETH_IS_BROADCAST(_addr)	(			\
-		((u8 *)(_addr))[0] == 0xff &&		\
-		((u8 *)(_addr))[1] == 0xff &&		\
-		((u8 *)(_addr))[2] == 0xff &&		\
-		((u8 *)(_addr))[3] == 0xff &&		\
-		((u8 *)(_addr))[4] == 0xff &&		\
-		((u8 *)(_addr))[5] == 0xff)	/*  Is Broadcast Address? */
-
-#endif /*  #ifndef __INC_ETHERNET_H */

drivers/staging/r8188eu/include/rtw_recv.h

@@ -20,6 +20,8 @@
 
 #define MAX_SUBFRAME_COUNT	64
 
+#define LLC_HEADER_SIZE 6
+
 /* for Rx reordering buffer control */
 struct recv_reorder_ctrl {
 	struct adapter	*padapter;

drivers/staging/r8188eu/os_dep/recv_linux.c

@@ -10,7 +10,6 @@
 #include "../include/recv_osdep.h"
 
 #include "../include/osdep_intf.h"
-#include "../include/ethernet.h"
 #include "../include/usb_ops.h"
 
 /* init os related resource in struct recv_priv */