Fix wrong error code returned when querying the Windows registry #5621
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Calling GetLastError() will not return the error code for the Windows registry APIs,
since they return a LSTATUS value which already the error code.
This also fixes the RegistryTablesTest.test_registry_non_existing_key
test case which was incorrectly expecting success when querying
for a non-existent registry key.
Ported from https://github.com/osql/osql/pull/50