RegistryQueryString() may produce one or more "File not found" errors
when called from RegistryQueryStringWait() - which is expected while
waiting. Those errors were annoying and awkward to read in the log.
Furthermore, should RegistryQueryString() fail, it already displays
detailed Windows error message and the parent's logging was simplified
to prevent repetitions in the log.
Signed-off-by: Simon Rozman <simon@rozman.si>
84c066fa79