ntdll/tests: make sure a return value is used (LLVM/Clang) (1/2)

[Austin English]

-- 
-Austin
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diff --git a/dlls/ntdll/tests/env.c b/dlls/ntdll/tests/env.c
index 8289841..6bd1530 100644
--- a/dlls/ntdll/tests/env.c
+++ b/dlls/ntdll/tests/env.c
@@ -244,6 +244,7 @@ static void testExpand(void)
         us_dst.Buffer = NULL;
 
         nts = pRtlExpandEnvironmentStrings_U(small_env, &us_src, &us_dst, &ul);
+        ok(nts == STATUS_BUFFER_TOO_SMALL, "Call failed (%u)\n", nts);
         ok(ul == strlen(test->dst) * sizeof(WCHAR) + sizeof(WCHAR), 
            "Wrong  returned length for %s: %u\n", test->src, ul );