sshauthopt_merge
merge_opts = sshauthopt_merge(key_opts, \
struct sshauthopt *sshauthopt_merge(const struct sshauthopt *primary,
if ((auth_opts = sshauthopt_merge(old, opts, &emsg)) == NULL) {
if ((final_opts = sshauthopt_merge(principals_opts,
if ((finalopts = sshauthopt_merge(keyopts, certopts, &reason)) == NULL)