dmime/tests: Fix a crash in Windows 2000

[Bruno Jesus]

http://test.winehq.org/data/65507cc83f8c39d5d47cacc11355ad6481cab31c/2000_fg-win2000-up1/dmime:dmime.html
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diff --git a/dlls/dmime/tests/dmime.c b/dlls/dmime/tests/dmime.c
index 1258d40..03b0a37 100644
--- a/dlls/dmime/tests/dmime.c
+++ b/dlls/dmime/tests/dmime.c
@@ -380,6 +380,10 @@ static void test_audiopathconfig(void)
 
     hr = CoCreateInstance(&CLSID_DirectMusicAudioPathConfig, NULL, CLSCTX_INPROC_SERVER,
             &IID_IDirectMusicObject, (void**)&dmo);
+    if (hr == REGDB_E_CLASSNOTREG) {
+        win_skip("DirectMusicAudioPathConfig not registered\n");
+        return;
+    }
     ok(hr == S_OK, "DirectMusicAudioPathConfig create failed: %08x, expected S_OK\n", hr);
 
     /* IPersistStream */