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

[Austin English]

-- 
-Austin
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diff --git a/dlls/advapi32/tests/registry.c b/dlls/advapi32/tests/registry.c
index 42ff232..5316e95 100644
--- a/dlls/advapi32/tests/registry.c
+++ b/dlls/advapi32/tests/registry.c
@@ -1199,6 +1199,7 @@ static void test_reg_close_key(void)
      * hkHandle remains changed after call to RegCloseKey
      */
     ret = RegOpenKeyA(HKEY_CURRENT_USER, "Software\\Wine\\Test", &hkHandle);
+    ok(ret == ERROR_SUCCESS, "expected ERROR_SUCCESS, got %d\n", ret);
     ret = RegCloseKey(hkHandle);
     ok(ret == ERROR_SUCCESS, "expected ERROR_SUCCESS, got %d\n", ret);