dmusic: Indirection level fix

[Andrew Talbot]

Changelog:
    dmusic: Indirection level fix.

diff --git a/dlls/dmusic/dmusic_main.c b/dlls/dmusic/dmusic_main.c
index b952f5a..24901ba 100644
--- a/dlls/dmusic/dmusic_main.c
+++ b/dlls/dmusic/dmusic_main.c
@@ -400,7 +400,7 @@ const char *debugstr_dmguid (const GUID
         if (!id) return "(null)";
 
 	for (i = 0; i < sizeof(guids)/sizeof(guids[0]); i++) {
-		if (IsEqualGUID(id, &guids[i].guid))
+		if (IsEqualGUID(id, guids[i].guid))
 			return guids[i].name;
 	}
 	/* if we didn't find it, act like standard debugstr_guid */