lib/repo-pull: Fix a potential minor leak
lib/repo-pull: Fix a potential minor leak

If override-remote-name is specified in the options to
ostree_repo_pull_with_options(), but the remote_name_or_baseurl argument
is also set to a remote name, the override-remote-name would be leaked.

Note that this is currently an invalid configuration, so this leak is
basically never hit.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Closes: #1202
Approved by: cgwalters

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