add more condition checking

Author: 36952362

modules/tls_mgm/tls_domain.c

@@ -133,7 +133,7 @@ void tls_free_domain(struct tls_domain *dom)
 		while (m_it) {
 			m_tmp = m_it;
 			m_it = m_it->next;
-			if (m_tmp->s.s) {
+			if (m_tmp->s.s && m_tmp->s.len > 0) {
 				shm_free(m_tmp->s.s);
 			}
 			shm_free(m_tmp);
@@ -142,7 +142,7 @@ void tls_free_domain(struct tls_domain *dom)
 		while (m_it) {
 			m_tmp = m_it;
 			m_it = m_it->next;
-			if (m_tmp->s.s) {
+			if (m_tmp->s.s && m_tmp->s.len > 0) {
 				shm_free(m_tmp->s.s);
 			}
 			shm_free(m_tmp);