staging: r8188eu: option in struct sta_xmit_priv is not used

The option component in struct sta_xmit_priv is not used, remove it.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20230130195303.138941-9-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/rtw_xmit.h

@@ -227,7 +227,6 @@ struct tx_servq {
 
 struct sta_xmit_priv {
 	spinlock_t lock;
-	int	option;
 	struct tx_servq	be_q;			/* priority == 0,3 */
 	struct tx_servq	bk_q;			/* priority == 1,2 */
 	struct tx_servq	vi_q;			/* priority == 4,5 */