[PATCH] s3-lib: fix segf while reading incomplete session info (bug #10003)

[Bjoern Baumbach]

Hi!

If we are listing connections with net status shares or smbstatus, it's
possible that we get an incomplete session.
For this case we need to check if the session_info is already set or
not, otherwise we're using invalid pointers and the tools are segfaulting.

Please find and push (or comment) the attached patch-set by Metze and me.

There is an additional patch that avoids that we print incomplete
sessions e.g. without a service name.

Thanks
Björn

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