[PATCH] --script-updatedb finishes with "Aborting database update."

Hi all,

I'm getting the following with --script-updatedb:

Starting Nmap 4.65 ( http://nmap.org ) at 2008-06-06 14:59 GMT Standard Time
NSE script database updated successfully.
SCRIPT ENGINE: Aborting database update.
Nmap done: 0 IP addresses (0 hosts up) scanned in 0.078 seconds

which seems to be caused by comparing "ret" in nse_main.cc:125 without
it being initialised.

I'm not quite certain that the attached patch is the best way to fix
that, but it works for me and doesn't look like it would cause any problems.

Regards,

jah

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