suppress harmless warning about possibly uninitialized variable in OpenLogFile() in OSX build

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61303 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/logg.cpp

@@ -1142,7 +1142,7 @@ static int OpenLogFile(wxFile& file, wxString *pFilename, wxWindow *parent)
 
     // open file
     // ---------
-    bool bOk;
+    bool bOk = true; // suppress warning about it being possible uninitialized
     if ( wxFile::Exists(filename) ) {
         bool bAppend = false;
         wxString strMsg;