staging: r8188eu: last_rx_mgnt_pkts is set but not used

last_rx_mgnt_pkts in struct stainfo_stats is set but not used.
Remove it.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220515155401.352742-5-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/sta_info.h

@@ -48,7 +48,6 @@ struct	stainfo_stats	{
 	u64 rx_ctrl_pkts;
 	u64 rx_data_pkts;
 
-	u64	last_rx_mgnt_pkts;
 	u64 last_rx_beacon_pkts;
 	u64 last_rx_probereq_pkts;
 	u64 last_rx_probersp_pkts;
@@ -230,7 +229,6 @@ struct sta_info {
 
 #define sta_update_last_rx_pkts(sta) \
 do { \
-	sta->sta_stats.last_rx_mgnt_pkts = sta->sta_stats.rx_mgnt_pkts; \
 	sta->sta_stats.last_rx_beacon_pkts = sta->sta_stats.rx_beacon_pkts; \
 	sta->sta_stats.last_rx_probereq_pkts = sta->sta_stats.rx_probereq_pkts; \
 	sta->sta_stats.last_rx_probersp_pkts = sta->sta_stats.rx_probersp_pkts; \