dmstyle: Remove unused Wine debug channel

[Andrew Talbot]

Changelog:
    dmstyle: Remove unused Wine debug channel.

diff --git a/dlls/dmstyle/dmutils.c b/dlls/dmstyle/dmutils.c
index 7201461..fad115b 100644
--- a/dlls/dmstyle/dmutils.c
+++ b/dlls/dmstyle/dmutils.c
@@ -40,7 +40,6 @@
 
 #include "dmutils.h"
 
-WINE_DEFAULT_DEBUG_CHANNEL(dmusic);
 WINE_DECLARE_DEBUG_CHANNEL(dmfile);
 
 HRESULT IDirectMusicUtils_IPersistStream_ParseDescGeneric (DMUS_PRIVATE_CHUNK* pChunk, IStream* pStm, LPDMUS_OBJECTDESC pDesc) {