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

Signed-off-by: Sven Baars <sven.wine@gmail.com>
Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>

dlls/xmllite/tests/writer.c

@@ -483,6 +483,7 @@ todo_wine
     CHECK_OUTPUT_RAW(stream, utf16_outputW, sizeof(utf16_outputW));
 
     IStream_Release(stream);
+    IUnknown_Release(output);
 
     /* Create output with meaningless code page value. */
     hr = CreateStreamOnHGlobal(NULL, TRUE, &stream);