hostapd: fix a segfault in the error path of the nl80211 bss interface add function

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@19496 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/hostapd/patches/150-mbss_driver_handling.patch

@@ -903,8 +903,12 @@
  		return -1;
  	}
  
-@@ -4484,9 +4483,12 @@ static int wpa_driver_nl80211_if_add(con
+@@ -4481,12 +4480,15 @@ static int wpa_driver_nl80211_if_add(con
- 			os_free(bss);
+ 	if (type == WPA_IF_AP_BSS) {
+ 		if (linux_set_iface_flags(drv->ioctl_sock, ifname, 1)) {
+ 			nl80211_remove_iface(drv, ifidx);
+-			os_free(bss);
++			os_free(new_bss);
  			return -1;
  		}
 -		bss->ifindex = ifidx;