staging: vt6656: replaced MAX_DATA_LEN with ETH_DATA_LEN

Removed custom macro with one from include/linux/if_ether.h.

Signed-off-by: Andres More <more.andres@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/vt6656/rxtx.c b/drivers/staging/vt6656/rxtx.c
index b20cdc6..eaead0c 100644
--- a/drivers/staging/vt6656/rxtx.c
+++ b/drivers/staging/vt6656/rxtx.c
@@ -1466,7 +1466,7 @@
     memset(pTxBufHead, 0, sizeof(TX_BUFFER));
 
     // Get pkt type
-    if (ntohs(psEthHeader->wType) > MAX_DATA_LEN) {
+    if (ntohs(psEthHeader->wType) > ETH_DATA_LEN) {
         if (pDevice->dwDiagRefCount == 0) {
             cb802_1_H_len = 8;
         } else {
@@ -1701,7 +1701,7 @@
     }
 
     // 802.1H
-    if (ntohs(psEthHeader->wType) > MAX_DATA_LEN) {
+    if (ntohs(psEthHeader->wType) > ETH_DATA_LEN) {
         if (pDevice->dwDiagRefCount == 0) {
             if ( (psEthHeader->wType == TYPE_PKT_IPX) ||
                  (psEthHeader->wType == cpu_to_le16(0xF380))) {