staging: vt6656: [BUG] set usb_fill_int_urb interval to 1

As result of patch
staging: vt6656: [BUG] Fix Warning BOGUS urb xfer, pipe 3 != type 1

has resulted in sluggish TX performance due to interupt inverval
being too long.

Set int_interval to 1 as set in bInterval of endpoint 1.
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/main_usb.c

@@ -1007,7 +1007,7 @@ static int  device_open(struct net_device *dev)
 
 	schedule_delayed_work(&pDevice->second_callback_work, HZ);
 
-	pDevice->int_interval = 100;  /* max 100 microframes */
+	pDevice->int_interval = 1;  /* bInterval is set to 1 */
     pDevice->eEncryptionStatus = Ndis802_11EncryptionDisabled;
 
     pDevice->bIsRxWorkItemQueued = true;