advapi32/tests: make sure to use return value (LLVM/Clang) (1/2)

[Austin English]

-- 
-Austin
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diff --git a/dlls/advapi32/tests/security.c b/dlls/advapi32/tests/security.c
index e1f06c8..bfe9783 100644
--- a/dlls/advapi32/tests/security.c
+++ b/dlls/advapi32/tests/security.c
@@ -1817,6 +1817,7 @@ static void check_wellknown_name(const char* name, WELL_KNOWN_SID_TYPE result)
     sid_size = 0;
     domain_size = 0;
     ret = LookupAccountNameA(NULL, name, NULL, &sid_size, NULL, &domain_size, &sid_use);
+    ok(!ret, " %s Should have failed to lookup account name\n", name);
     psid = HeapAlloc(GetProcessHeap(),0,sid_size);
     domain = HeapAlloc(GetProcessHeap(),0,domain_size);
     ret = LookupAccountNameA(NULL, name, psid, &sid_size, domain, &domain_size, &sid_use);