OS X g++ warned that "control may reach end of non-void function" in
wxRichTextHelpInfo::ShowHelp(). This wasn't really the case but change the
function logic slightly to (hopefully) suppress the warning.
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@68111 
c3d73ce0-8a6f-49c7-b76d-
6d57e0e08775
         
     virtual bool ShowHelp(wxWindow* win)
     {
         
     virtual bool ShowHelp(wxWindow* win)
     {
-        if (m_uiCustomization && m_helpTopic != -1)
-            return m_uiCustomization->ShowHelp(win, m_helpTopic);
-        else
+        if ( !m_uiCustomization || m_helpTopic == -1 )
+
+        return m_uiCustomization->ShowHelp(win, m_helpTopic);
     }
 
     /// Get the help topic identifier.
     }
 
     /// Get the help topic identifier.