Fix `mosquitto_publish*()` no longer returning `MOSQ_ERR_NO_CONN`.

This was always returning success when the client was not connected.

Closes #1725. Thanks to BOTorioN.

ChangeLog.txt

@@ -14,6 +14,8 @@ Broker:
 
 Client library:
 - Improved documentation around connect callback return codes. Close #1730.
+- Fix `mosquitto_publish*()` no longer returning `MOSQ_ERR_NO_CONN` when not
+  connected. Closes #1725.
 
 
 1.6.10 - 2020-05-25

lib/actions.c

@@ -151,9 +151,9 @@ int mosquitto_publish_v5(struct mosquitto *mosq, int *mid, const char *topic, in
 
 		pthread_mutex_lock(&mosq->msgs_out.mutex);
 		message->state = mosq_ms_invalid;
-		message__queue(mosq, message, mosq_md_out);
+		rc = message__queue(mosq, message, mosq_md_out);
 		pthread_mutex_unlock(&mosq->msgs_out.mutex);
-		return MOSQ_ERR_SUCCESS;
+		return rc;
 	}
 }