decoder/flac: pass VorbisComment to flac_parse_mixramp()

src/decoder/plugins/FlacCommon.cxx

@@ -101,7 +101,8 @@ void flac_metadata_common_cb(const FLAC__StreamMetadata * block,
 		if (flac_parse_replay_gain(rgi, block->data.vorbis_comment))
 			decoder_replay_gain(data->decoder, &rgi);
 
-		decoder_mixramp(data->decoder, flac_parse_mixramp(block));
+		decoder_mixramp(data->decoder,
+				flac_parse_mixramp(block->data.vorbis_comment));
 
 		data->tag = flac_vorbis_comments_to_tag(&block->data.vorbis_comment);
 		break;

src/decoder/plugins/FlacMetadata.cxx

@@ -50,11 +50,8 @@ flac_parse_replay_gain(ReplayGainInfo &rgi,
 }
 
 MixRampInfo
-flac_parse_mixramp(const FLAC__StreamMetadata *block)
+flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc)
 {
-	const FLAC__StreamMetadata_VorbisComment &vc =
-		block->data.vorbis_comment;
-
 	MixRampInfo mix_ramp;
 
 	const auto *comments = vc.comments;

src/decoder/plugins/FlacMetadata.hxx

@@ -119,7 +119,7 @@ flac_parse_replay_gain(ReplayGainInfo &rgi,
 		       const FLAC__StreamMetadata_VorbisComment &vc);
 
 MixRampInfo
-flac_parse_mixramp(const FLAC__StreamMetadata *block);
+flac_parse_mixramp(const FLAC__StreamMetadata_VorbisComment &vc);
 
 Tag
 flac_vorbis_comments_to_tag(const FLAC__StreamMetadata_VorbisComment *comment);