iscsi: don't leak portal string when starting a pool
iscsi: don't leak portal string when starting a pool

https://bugzilla.redhat.com/show_bug.cgi?id=975392
(cherry picked from commit 413274f63b8f2da3b1a4adfdf1cbc0df7a0e0316)

mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2,mithleshvrts/libvirt-0.10.2