ntdll/directory.c wine_nt_to_unix_file_name() parse string to int instead of cast char, where string may be passed

[A C Hurst]

Fixes a problem I noticed with EnumSerialPorts, when it tries to enumerate COM ports 1 - 255 using
CreateFile().
e.g. dev = "com236" would succesfully find /dev/ttyS1 through the dev[3] cast passed to
get_default_com_device, when stat(.. "<configdir>/dosdevices/com236" ..) fails and falls though.
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