[Samba] chmod of smbpasswd file

[Jones Syue 薛懷宗]

> Thanks a lot Jones. I did a minor change to
> your code and pushed a version without the
> goto to the MR :-). Let me know if you're
> happy with that.

Thank you Jeremy! Your version is better and cleaner, after testing it works 
for me and I am happy with it :)
found a minor suggest: should we add a whitespace between 'if' and '(' on 
line [f]chmod() to match README.Coding :)

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Regards,
Jones Syue | 薛懷宗
QNAP Systems, Inc.