s3: smbd: In create_conn_struct_cwd(), don't TALLOC_FREE() an unallocated pointer...

s3: smbd: In create_conn_struct_cwd(), don't TALLOC_FREE() an unallocated pointer on error.

Just return the status - if create_conn_struct_as_root() fails
the connection struct never gets returned.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14809

Signed-off-by: Jeremy Allison <jra@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Wed Aug 25 17:09:23 UTC 2021 on sn-devel-184

(cherry picked from commit 857045f3a236dea125200dd09279d677e513682b)