staging: vt6656: Fix warning: unused variable vnt_frame_time

In commit 61bb798767
("staging: vt6656: vnt_get_rtscts_rsvtime_le replace with rts/cts duration.")
not quite all of the code was removed.

Remove unused vnt_frame_time variable.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Malcolm Priestley <tvboxspy@gmail.com>
Link: https://lore.kernel.org/r/5096f399-03e7-77e1-b334-947aabc44d14@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/rxtx.c

@@ -39,10 +39,6 @@ static const u16 vnt_time_stampoff[2][MAX_RATE] = {
 #define DATADUR_B       10
 #define DATADUR_A       11
 
-static const u16 vnt_frame_time[MAX_RATE] = {
-	10, 20, 55, 110, 24, 36, 48, 72, 96, 144, 192, 216
-};
-
 static const u8 vnt_phy_signal[] = {
 	0x00,	/* RATE_1M  */
 	0x01,	/* RATE_2M  */