Fix hang when waiting for condition variables.

src/libespeak-ng/fifo.c

 
 	// leave once the thread is actually started
 	assert(-1 != pthread_mutex_lock(&my_mutex));
-	while ((my_stop_is_acknowledged == 0) || ((pthread_cond_wait(&my_cond_stop_is_acknowledged, &my_mutex) == -1) && errno == EINTR))
+	while (my_stop_is_acknowledged == 0)
-		continue; // Restart when interrupted by handler
+while((pthread_cond_wait(&my_cond_stop_is_acknowledged, &my_mutex) == -1) && errno == EINTR)
+	;
 	my_stop_is_acknowledged = 0;
 	pthread_mutex_unlock(&my_mutex);
 }
 	}
 
 	if (a_command_is_running) {
-		while ((my_stop_is_acknowledged == 0) || ((pthread_cond_wait(&my_cond_stop_is_acknowledged, &my_mutex) == -1) && errno == EINTR))
+		while (my_stop_is_acknowledged == 0)
-			continue; // Restart when interrupted by handler
+			while((pthread_cond_wait(&my_cond_stop_is_acknowledged, &my_mutex) == -1) && errno == EINTR)
+				continue; // Restart when interrupted by handler
 	}
 
 	my_stop_is_required = 0;
 		assert(!a_status);
 
 		if (!a_start_is_required) {
-			while ((my_start_is_required == 0) || ((pthread_cond_wait(&my_cond_start_is_required, &my_mutex) == -1) && errno == EINTR))
+			while (my_start_is_required == 0)
+				while((pthread_cond_wait(&my_cond_start_is_required, &my_mutex) == -1) && errno == EINTR)
 				continue; // Restart when interrupted by handler
 		}