Decoder sink obtained by gst_element_get_pad in new_pad callback is not
dereferenced.
The problematic code is
  /* We can now link this pad with the audio decoder */
  g_print ("Dynamic pad created, linking parser/decoder\n");
  gst_pad_link (pad, gst_element_get_pad (decoder, "sink"));
I have tried to get the pad in the main function and print reference count
before return statement (after cleanup). The result was 2 (one for the instance
referenced in new_pad() function and one for the instance from main()) whereas
only 1 was expected.