mac80211: work around a race condition on detecting a phy while bringing it up

When reloading modules and running wifi, a phy can sometimes be renamed
while in the middle of a hotplug call that tries to detect new phys
This can lead to bogus wifi-device sections being created

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/files/lib/wifi/mac80211.sh

@@ -167,6 +167,10 @@ detect_mac80211() {
 
 		path="$(iwinfo nl80211 path "$dev")"
 		macaddr="$(cat /sys/class/ieee80211/${dev}/macaddress)"
+
+		# work around phy rename related race condition
+		[ -n "$path" -o -n "$macaddr" ] || continue
+
 		board_dev=
 		fallback_board_dev=
 		json_for_each_item check_board_phy wlan