Bug 538930 - [@ @0x0 | nsNotifyAddrListener::Run] assumes InitIPHelperLibrary will never fail and that sNotifyAddrChange will be non null, r=biesi

netwerk/system/win32/nsNotifyAddrListener.cpp

@@ -177,6 +177,11 @@ nsNotifyAddrListener::Run()
 
     InitIPHelperLibrary();
 
+    if (!sNotifyAddrChange) {
+        CloseHandle(ev);
+        return NS_ERROR_NOT_AVAILABLE;
+    }
+
     overlapped.hEvent = ev;
     while (!shuttingDown) {
         HANDLE h;