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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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	name="0001-s4-ntvfs-check-if-pvfs-is-NULL-in-pvfs_logoff.patch"
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	filename="0001-s4-ntvfs-check-if-pvfs-is-NULL-in-pvfs_logoff.patch"
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