Fix a segfault on exit

When we ran CZNC::~CZNC() we called DeleteUsers() which called
RestartConnectUser(). Since we had already deleted that timer, we called
some already deleted class.


git-svn-id: https://znc.svn.sourceforge.net/svnroot/znc/trunk@908 726aef4b-f618-498e-8847-2d620e286838

znc.cpp

@@ -53,6 +53,7 @@ CZNC::~CZNC() {
 		a->second->SetBeingDeleted(true);
 	}
 
+	m_pConnectUserTimer = NULL;
 	// This deletes m_pConnectUserTimer
 	m_Manager.Cleanup();
 	DeleteUsers();
@@ -305,7 +306,7 @@ void CZNC::DeleteUsers() {
 	}
 
 	m_msUsers.clear();
-	RestartConnectUser();
+	DisableConnectUser();
 }
 
 CUser* CZNC::GetUser(const CString& sUser) {