Remove all Vorbis comments matching the given field name.
\param object A pointer to an existing VORBIS_COMMENT object.
\param field_name The field name of comments to delete.
\assert
\code object != NULL \endcode
\code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode
\retval int
\c -1 for memory allocation error, \c 0 for no matching entries,
else the number of matching entries deleted.
Remove all Vorbis comments matching the given field name.
\param object A pointer to an existing VORBIS_COMMENT object. \param field_name The field name of comments to delete. \assert \code object != NULL \endcode \code object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT \endcode \retval int \c -1 for memory allocation error, \c 0 for no matching entries, else the number of matching entries deleted.