dinput/tests: Release the instance after tests (valgrind)

[Bruno Jesus]

Fixes bug https://bugs.winehq.org/show_bug.cgi?id=36262
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diff --git a/dlls/dinput/tests/dinput.c b/dlls/dinput/tests/dinput.c
index cc28985..0490642 100644
--- a/dlls/dinput/tests/dinput.c
+++ b/dlls/dinput/tests/dinput.c
@@ -603,6 +603,7 @@ static void test_DirectInputJoyConfig8(void)
                "IDirectInput_CreateDevice failed with guid from GetConfig hr = 0x%08x\n", hr);
     }
 
+    IDirectInput_Release(pDI);
 }
 
 START_TEST(dinput)