fix stop watch cursor selecting an imap folder for the second time while offline, sr=mscott 244282

mailnews/imap/src/nsImapMailFolder.cpp

@@ -727,7 +727,8 @@ nsImapMailFolder::UpdateFolder(nsIMsgWindow *msgWindow)
       getter_AddRefs(eventQ));
     nsCOMPtr <nsIURI> url;
     rv = imapService->SelectFolder(eventQ, this, m_urlListener, msgWindow, getter_AddRefs(url));
-    m_urlRunning = PR_TRUE;
+    if (NS_SUCCEEDED(rv))
+      m_urlRunning = PR_TRUE;
     if (url)
     {
       nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(url);