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

src/libostree/ostree-repo-pull.c

@@ -3360,6 +3360,7 @@ ostree_repo_pull_with_options (OstreeRepo             *self,
     {
       g_autofree char *unconfigured_state = NULL;
 
+      g_free (pull_data->remote_name);
       pull_data->remote_name = g_strdup (remote_name_or_baseurl);
 
       /* Fetch GPG verification settings from remote if it wasn't already