constify first arg of FLAC__metadata_object_vorbiscomment_find_entry_from()

include/FLAC/metadata.h

@@ -1264,7 +1264,7 @@ FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC
  *    The offset in the comment array of the first comment whose field
  *    name matches \a field_name, or \c -1 if no match was found.
  */
-FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(FLAC__StreamMetadata *object, unsigned offset, const char *field_name);
+FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name);
 
 /*@@@@ needs unit test still */
 /** Remove first Vorbis comment matching the given field name.

src/libFLAC/metadata_object.c

@@ -777,7 +777,7 @@ FLAC_API FLAC__bool FLAC__metadata_object_vorbiscomment_entry_matches(const FLAC
 #undef FLAC__STRNCASECMP
 }
 
-FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
+FLAC_API int FLAC__metadata_object_vorbiscomment_find_entry_from(const FLAC__StreamMetadata *object, unsigned offset, const char *field_name)
 {
 	const unsigned field_name_length = strlen(field_name);
 	unsigned i;