staging: vt6656: Removed unused variable bb_vga_0

Missing part of staging: vt6656: Remove unused rf_type in card.c
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/09f65cf4839b089ad38f28ff691d5146e6095e58.1647284830.git.philipp.g.hortmann@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vt6656/card.c

@@ -438,7 +438,6 @@ int vnt_set_bss_mode(struct vnt_private *priv)
 	int ret;
 	unsigned char type = priv->bb_type;
 	unsigned char data = 0;
-	unsigned char bb_vga_0 = 0x1c;
 	unsigned char bb_vga_2_3 = 0x00;
 
 	ret = vnt_mac_set_bb_type(priv, type);
@@ -449,7 +448,6 @@ int vnt_set_bss_mode(struct vnt_private *priv)
 
 	if (priv->bb_type == BB_TYPE_11A) {
 		data = 0x03;
-		bb_vga_0 = 0x20;
 		bb_vga_2_3 = 0x10;
 	} else if (priv->bb_type == BB_TYPE_11B) {
 		data = 0x02;