Don't return "false" when a pointer is needed.

Return NULL and not false from wxFileTranslationsLoader::
GetAvailableTranslations().

This is, of course, more correct and also fixes a compilation problem with
Borland, see #12558.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65796 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/translation.cpp

@@ -1790,7 +1790,7 @@ wxMsgCatalog *wxResourceTranslationsLoader::LoadCatalog(const wxString& domain,
                              resname,
                              GetResourceType(),
                              GetModule()) )
-        return false;
+        return NULL;
 
     wxLogTrace(TRACE_I18N,
                "Using catalog from Windows resource \"%s\".", resname);