skins2: print only one error when the skins can't be loaded.

modules/gui/skins2/src/theme_loader.cpp

@@ -359,10 +359,7 @@ bool ThemeLoader::parse( const string &path, const string &xmlFile )
     // Start the parser
     SkinParser parser( getIntf(), xmlFile, path );
     if( ! parser.parse() )
-    {
-        msg_Err( getIntf(), "failed to parse %s", xmlFile.c_str() );
         return false;
-    }
 
     // Build and store the theme
     Builder builder( getIntf(), parser.getData(), path );