undid accidental change to assert in Start() during last commit

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@23877 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/timer.cpp

@@ -125,10 +125,10 @@ wxTimer::~wxTimer()
 
 bool wxTimer::Start(int milliseconds, bool oneShot)
 {
-    wxCHECK_MSG( m_milli > 0, false, wxT("invalid value for timer timeour") );
-
     (void)wxTimerBase::Start(milliseconds, oneShot);
 
+    wxCHECK_MSG( m_milli > 0, false, wxT("invalid value for timer timeour") );
+
     // find a window for SetTimer(): it should be a valid HWND owned by this
     // thread (even if we had a non NULL m_hwnd before, reset it in case the
     // owner has changed)