dmcompos/tests: Fix a memory leak (Valgrind).

Signed-off-by: Sven Baars <sven.wine@gmail.com>
Signed-off-by: Michael Stefaniuc <mstefani@winehq.org>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/dmcompos/tests/dmcompos.c

@@ -543,6 +543,7 @@ static void test_parsedescriptor(void)
     hr = IDirectMusicObject_ParseDescriptor(dmo, stream, &desc);
     ok(hr == DMUS_E_CHUNKNOTFOUND,
             "ParseDescriptor failed: %08x, expected DMUS_E_CHUNKNOTFOUND\n", hr);
+    IStream_Release(stream);
 
     /* All desc chunks, only DMUS_OBJ_OBJECT and DMUS_OBJ_CLASS supported */
     stream = gen_riff_stream(alldesc);