staging: vt6656: replaced U_CRC_LEN with ETH_FCS_LEN

Removed custom macro with one from include/linux/if_ether.h.
FCS is an Ethernet field that holds the CRC value.
Signed-off-by: NAndres More <more.andres@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

drivers/staging/vt6656/dpc.c

@@ -563,8 +563,8 @@ RXbBulkInProcessData (
     //
     // RX OK
     //
-    //remove the CRC length
-    FrameSize -= U_CRC_LEN;
+    /* remove the FCS/CRC length */
+    FrameSize -= ETH_FCS_LEN;
 
     if ( !(*pbyRsr & (RSR_ADDRBROAD | RSR_ADDRMULTI)) && // unicast address
         (IS_FRAGMENT_PKT((pbyFrame)))

drivers/staging/vt6656/rxtx.c

@@ -3235,7 +3235,8 @@ bRelayPacketSend (
     if (pDevice->wCurrentRate <= RATE_11M)
         byPktType = PK_TYPE_11B;
 
-    BytesToWrite = uDataLen + U_CRC_LEN;
+    BytesToWrite = uDataLen + ETH_FCS_LEN;
+
     // Convert the packet to an usb frame and copy into our buffer
     // and send the irp.
 

drivers/staging/vt6656/tether.h

@@ -36,7 +36,6 @@
 //
 // constants
 //
-#define U_CRC_LEN           4           //
 #define U_ETHER_ADDR_STR_LEN (ETH_ALEN * 2 + 1)
                                         // Ethernet address string length