output_all: added missing "unused" attribute

In NDEBUG, clear_tail_chunk() does not use its "chunk" parameter.

output_all: added missing "unused" attribute
f1eed721 · Max Kellermann · 975ca2da · f1eed721
Commit f1eed721 authored Mar 14, 2009 by Max Kellermann
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output_all.c src/output_all.c +1 -1

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--- a/src/output_all.c
+++ b/src/output_all.c
@@ -326,7 +326,7 @@ chunk_is_consumed(const struct music_chunk *chunk)
 * outputs have consumed it already.  Clear the reference.
 */
 static void
-clear_tail_chunk(const struct music_chunk *chunk, bool *locked)
+clear_tail_chunk(G_GNUC_UNUSED const struct music_chunk *chunk, bool *locked)
 {
 	assert(chunk->next == NULL);
 	assert(music_pipe_contains(g_mp, chunk));