Applied #9520: Fix to allow repeated use of wxFileDialog object

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@62110 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/mac/carbon/filedlg.cpp

@@ -278,6 +278,9 @@ pascal Boolean CrossPlatformFilterCallback(
 
 int wxFileDialog::ShowModal()
 {
+    m_paths.Empty();
+    m_fileNames.Empty();
+
     OSErr err;
     NavDialogCreationOptions dialogCreateOptions;