sysroot: Fix a leak in deployment dirpath API
sysroot: Fix a leak in deployment dirpath API

This one is pretty obvious in retrospect.

Closes: #410
Approved by: giuseppe

gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree,gatispaeglis/ostree,GNOME/ostree,GNOME/ostree,gatispaeglis/ostree,gatispaeglis/ostree