Patch for srvsvc opnums 0x27 and 0x28 - security dialogues from Win9x using (PATCH#457)

[Jeremy Allison]

Jim,

	I added some error checking to this patch and also
changed the way the user name etc. was retrieved to make it
match the printing code.

Can you check out 2.2 or HEAD and test I didn't break it ?

Thanks a *lot* for this fix !

Jeremy.

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