[PATCH] s4-ntvfs: check if pvfs is NULL in pvfs_logoff

[brendan powers]

Hello,

I ran into a problem where if I shared a directory that did not exist,
samba would segfault. This was caused by pvfs_logoff not checking if
the pvfs pointer was valid. I assume this was caused by the directory
not existing, so no log on actually occurred.

The patch is attached.
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