staging: r8188eu: evt_allocated_buf is not used

evt_allocated_buf in struct evt_priv is not used. Remove it.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220216081657.622467-2-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/rtw_cmd.h

@@ -55,7 +55,6 @@ struct	evt_priv {
 	#define C2H_QUEUE_MAX_LEN 10
 	atomic_t event_seq;
 	u8	*evt_buf;	/* shall be non-paged, and 4 bytes aligned */
-	u8	*evt_allocated_buf;
 	u32	evt_done_cnt;
 };