From 3e4f91ae50319bf240c08269d9729a20f7a164af Mon Sep 17 00:00:00 2001
From: David Cermak <cermak@espressif.com>
Date: Mon, 10 Feb 2020 07:58:36 +0100
Subject: [PATCH] Client: unlock if unsubscribe message fails to be created

In a similar way as for the subscribe message
---
 mqtt_client.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/mqtt_client.c b/mqtt_client.c
index f2f8de0..fba72e3 100644
--- a/mqtt_client.c
+++ b/mqtt_client.c
@@ -1492,6 +1492,7 @@ int esp_mqtt_client_unsubscribe(esp_mqtt_client_handle_t client, const char *top
                                           topic,
                                           &client->mqtt_state.pending_msg_id);
     if (client->mqtt_state.outbound_message->length == 0) {
+        MQTT_API_UNLOCK(client);
         ESP_LOGE(TAG, "Unubscribe message cannot be created");
         return -1;
     }