staging: rtl8712: Fix some Sparse endian messages

Sparse reports the following:

  CHECK   drivers/staging/rtl8712/rtl8712_xmit.c
drivers/staging/rtl8712/rtl8712_xmit.c:564:42: warning: cast from restricted __le32
drivers/staging/rtl8712/rtl8712_xmit.c:569:42: warning: cast from restricted __le32
drivers/staging/rtl8712/rtl8712_xmit.c:571:42: warning: cast from restricted __le32

Each of these cases is transferring a quantity that is little-endian. There
is no need for conversion.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl8712_xmit.c

@@ -561,14 +561,14 @@ static void update_txdesc(struct xmit_frame *pxmitframe, uint *pmem, int sz)
 
 			ptxdesc_mp = &txdesc_mp;
 			/* offset 8 */
-			ptxdesc->txdw2 = cpu_to_le32(ptxdesc_mp->txdw2);
+			ptxdesc->txdw2 = ptxdesc_mp->txdw2;
 			if (bmcst)
 				ptxdesc->txdw2 |= cpu_to_le32(BMC);
 			ptxdesc->txdw2 |= cpu_to_le32(BK);
 			/* offset 16 */
-			ptxdesc->txdw4 = cpu_to_le32(ptxdesc_mp->txdw4);
+			ptxdesc->txdw4 = ptxdesc_mp->txdw4;
 			/* offset 20 */
-			ptxdesc->txdw5 = cpu_to_le32(ptxdesc_mp->txdw5);
+			ptxdesc->txdw5 = ptxdesc_mp->txdw5;
 			pattrib->pctrl = 0;/* reset to zero; */
 		}
 	} else if (pxmitframe->frame_tag == MGNT_FRAMETAG) {