BUG 9574: Fix a possible null pointer dereference in spoolss.
If the the client enumerates the printers and didn't specify a
servername we have a null pointer dereference, so the process serving
the connection crashes.
Reviewed-by: David Disseldorp <ddiss@samba.org>
Autobuild-User(master): David Disseldorp <ddiss@samba.org>
Autobuild-Date(master): Mon Jan 21 13:30:11 CET 2013 on sn-devel-104
(cherry picked from commit
c38fb0b106b62e42a5b75b1c78386bb8912c7d7e)
(cherry picked from commit
a2d68842ea33733fa7900831ed10e73f820afcf7)