Remove likely obsolete Coverity suppression.

It can be added back if the issue reappears.

src/syncterm/ssh.c

@@ -340,7 +340,6 @@ ssh_output_thread(void *args)
 
 	SetThreadName("SSH Output");
 	conn_api.output_thread_running = 1;
-	// coverity[thread1_checks_field:SUPPRESS]
 	while (!conn_api.terminate) {
 		pthread_mutex_lock(&(conn_outbuf.mutex));
 		wr = conn_buf_wait_bytes(&conn_outbuf, 1, 100);