updated lwmqtt to fix not initialized return code

Author: 256dpi

Makefile

@@ -5,7 +5,7 @@ fmt:
 
 update:
 	rm -rf ./lwmqtt
-	git clone --branch v0.6.1 https://github.com/256dpi/lwmqtt.git ./lwmqtt
+	git clone --branch v0.6.2 https://github.com/256dpi/lwmqtt.git ./lwmqtt
 	mkdir -p ./src/lwmqtt
 	cp -r ./lwmqtt/src/*.c ./src/lwmqtt/
 	cp -r ./lwmqtt/src/*.h ./src/lwmqtt/

src/lwmqtt/client.c

@@ -366,6 +366,9 @@ lwmqtt_err_t lwmqtt_connect(lwmqtt_client_t *client, lwmqtt_options_t options, l
   // reset pong pending flag
   client->pong_pending = false;
 
+  // initialize return code
+  *return_code = LWMQTT_UNKNOWN_RETURN_CODE;
+
   // encode connect packet
   size_t len;
   lwmqtt_err_t err = lwmqtt_encode_connect(client->write_buf, client->write_buf_size, &len, options, will);