update: don't free the temp pointer, but free the original instead.

src/misc/update.c

@@ -1731,11 +1731,11 @@ end:
         stream_Delete( p_stream );
     if( p_file )
         fclose( p_file );
-    free( psz_destination );
     free( psz_destfile );
     free( p_buffer );
     free( psz_size );
 
+    free( p_udt->psz_destination );
     p_udt->p_update->p_download = NULL;
 
     vlc_object_release( p_udt );