advapi32/tests: make sure to use return value (LLVM/Clang) (2/2)

[Austin English]

-- 
-Austin
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diff --git a/dlls/advapi32/tests/service.c b/dlls/advapi32/tests/service.c
index 5bacb1b..e86208f 100644
--- a/dlls/advapi32/tests/service.c
+++ b/dlls/advapi32/tests/service.c
@@ -1561,6 +1561,7 @@ static void test_enum_svc(void)
     neededW = 0xdeadbeef;
     ret = pEnumServicesStatusExW(scm_handle, 0, SERVICE_WIN32, SERVICE_STATE_ALL,
                                  NULL, 0, &neededW, &returnedW, NULL, NULL);
+    ok(!ret, "Expected failure\n");
     ok(neededW == needed, "Expected needed buffersize to be the same for A- and W-calls\n");
 
     /* Store the needed bytes */