Do not return a probe score from set_codec_from_probe_data() if the codec was ignored.

This is a workaround for the issue that stream probing can use
the score of another codec type for mpeg stream autodetection.
Fixes ticket #3821.
Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Do not return a probe score from set_codec_from_probe_data() if the codec was ignored.

Merged-by: Michael Niedermayer <michaelni@gmx.at>