data_skip_key
di->dp = data_skip_key(di->data, di->dp, di->key);
ndp = data_skip_key(data, dp, key);
static unsigned char *data_skip_key(Repodata *data, unsigned char *dp, Repokey *key);
dp = data_skip_key(data, dp, data->keys + *keyp);
dp = data_skip_key(data, dp, data->keys + k);
*dpp = data_skip_key(data, dp, key);