pull: Squash a `-Wmaybe-uninitialized` warning
pull: Squash a `-Wmaybe-uninitialized` warning

Tempting to make it fatal...but we'd have to basically init all
of our variables I think.

Closes: #734
Approved by: jlebon

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