hostapd: do not remove foreign wpa_supplicant sockets

https://dev.openwrt.org/ticket/17886

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 42586

package/network/services/hostapd/files/netifd.sh

@@ -416,7 +416,7 @@ _wpa_supplicant_common() {
 
 wpa_supplicant_teardown_interface() {
 	_wpa_supplicant_common "$1"
-	rm -rf "$_rpath" "$_config"
+	rm -rf "$_rpath/$1" "$_config"
 }
 
 wpa_supplicant_prepare_interface() {