Bug 1736385 - Make sure thread is alive in CacheIOThread::ThreadFunc, r=necko-reviewers,valentin

Differential Revision: https://phabricator.services.mozilla.com/D193640

netwerk/cache2/CacheIOThread.cpp

@@ -388,6 +388,7 @@ void CacheIOThread::ThreadFunc() {
     if (threadInternal) threadInternal->SetObserver(this);
 
     mXPCOMThread = xpcomThread.forget().take();
+    nsCOMPtr<nsIThread> thread = NS_GetCurrentThread();
 
     lock.NotifyAll();
 
@@ -408,7 +409,6 @@ void CacheIOThread::ThreadFunc() {
         bool processedEvent;
         nsresult rv;
         do {
-          nsIThread* thread = mXPCOMThread;
           rv = thread->ProcessNextEvent(false, &processedEvent);
 
           ++mEventCounter;