staging; vt6656: rxtx add current_rate into vnt_usb_send_context as tx_rate

Create u8 tx_rate and remove current_rate from function declarations
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/device.h

@@ -234,6 +234,7 @@ struct vnt_usb_send_context {
 	unsigned int buf_len;
 	u32 frame_len;
 	u16 tx_hdr_size;
+	u16 tx_rate;
 	u8 type;
 	u8 pkt_no;
 	u8 pkt_type;