net_ssh: Clean up properly in off-nominal paths.

* Add missing bbs_pthread_enable_cancel before continuing.
* Clean up SSH session if ssh_bind_accept fails.

Author: InterLinked1

nets/net_ssh.c

@@ -1967,6 +1967,8 @@ static void *ssh_listener(void *unused)
 		if (ssh_bind_accept(sshbind, session) == SSH_ERROR) {
 			bbs_pthread_disable_cancel();
 			bbs_error("%s\n", ssh_get_error(sshbind));
+			ssh_disconnect(session);
+			ssh_free(session);
 			bbs_pthread_enable_cancel();
 			continue;
 		}
@@ -1975,6 +1977,7 @@ static void *ssh_listener(void *unused)
 		if (bbs_pthread_create_detached(&ssh_thread, NULL, ssh_connection, session)) {
 			ssh_disconnect(session);
 			ssh_free(session);
+			bbs_pthread_enable_cancel();
 			continue;
 		}
 		bbs_pthread_enable_cancel();