Fixed a memory leak in cli_set_mntpoint().

Fixes bug #10759 - Memory leak in libsmbclient in cli_set_mntpoint function

https://bugzilla.samba.org/show_bug.cgi?id=10759

Signed-off-by: Har Gagan Sahai <SHarGagan@novell.com>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Wed Aug 13 04:36:50 CEST 2014 on sn-devel-104