wifi: mac80211: set wiphy for virtual monitors

Drivers might plausibly want to have this, but also the
locking assertions will need it later.

Signed-off-by: Johannes Berg <[e-mail]>

net/mac80211/iface.c

···
 		 wiphy_name(local->hw.wiphy));
 	sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 	mutex_init(&sdata->wdev.mtx);
+	sdata->wdev.wiphy = local->hw.wiphy;
 
 	ieee80211_sdata_init(local, sdata);