dsound/tests: make sure to use a return value (LLVM/Clang)

[Austin English]

-- 
-Austin
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diff --git a/dlls/dsound/tests/duplex.c b/dlls/dsound/tests/duplex.c
index 11fb2a7..0f8d6d1 100644
--- a/dlls/dsound/tests/duplex.c
+++ b/dlls/dsound/tests/duplex.c
@@ -93,8 +93,9 @@ static void IDirectSoundFullDuplex_test(LPDIRECTSOUNDFULLDUPLEX dsfdo,
     ok(rc==DS_OK,"IDirectSoundFullDuplex_QueryInterface(IID_IDirectSoundFullDuplex) "
        "failed: %08x\n",rc);
     if (rc==DS_OK) {
-        ok (dsfdo==dsfd, "different interfaces\n");
+        ok(dsfdo==dsfd, "different interfaces\n");
         ref=IDirectSound8_Release(dsfd);
+        ok(ref==1, "IDirectSoundFullDuplex_Release() has %d references, should have 1\n", ref);
     }
 
     ref=IDirectSoundFullDuplex_Release(dsfdo);