secur32/tests: make sure a return value is used (LLVM/Clang)

[Austin English]

Seems to be some unrelated failures on WTB when the test is cross
compiled for NT4.

-- 
-Austin
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diff --git a/dlls/secur32/tests/ntlm.c b/dlls/secur32/tests/ntlm.c
index 027e094..ddc9462 100644
--- a/dlls/secur32/tests/ntlm.c
+++ b/dlls/secur32/tests/ntlm.c
@@ -968,6 +968,7 @@ static void testSignSeal(void)
     }
 
     sec_status = setupFakeServer(&server, sec_pkg_name);
+    ok(sec_status == SEC_E_OK, "setupFakeServer returned %s\n", getSecError(sec_status));
 
     while(client_stat == SEC_I_CONTINUE_NEEDED && server_stat == SEC_I_CONTINUE_NEEDED)
     {