static char* set_iovec_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value) {
        char *x;

        x = set_iovec_field(iovec, n_iovec, field, value);
        free(value);
        return x;
}
static char* set_iovec_field_free(struct iovec *iovec, size_t *n_iovec, const char *field, char *value) {
        char *x;

        x = set_iovec_field(iovec, n_iovec, field, value);
        free(value);
        return x;
}