mac80211: use bss_conf->dtim_period instead of conf.ps_dtim_period

sta_set_sinfo is obviously takes data for specific station.
This specific station is attached to a specific virtual
interface. Hence we should use the dtim_period from this
virtual interface rather than the system wide dtim_period.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/sta_info.c

@@ -1822,7 +1822,7 @@ void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
 	if (sdata->vif.bss_conf.use_short_slot)
 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
-	sinfo->bss_param.dtim_period = sdata->local->hw.conf.ps_dtim_period;
+	sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
 	sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
 
 	sinfo->sta_flags.set = 0;