Fix crash after client has been unable to connect to a broker

This is part of the cleanup routine when the client is already exiting. Closes eclipse#1246. Thanks to Christoph Krey.
ccvca · May 1, 2019 · 323759c · 323759c
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diff --git a/ChangeLog.txt b/ChangeLog.txt
@@ -8,6 +8,11 @@ Broker:
  `response-topic`. Closes #1244.
 - Fix build for WITH_TLS=no. Closes #1250.
 
+Client library:
+- Fix crash after client has been unable to connect to a broker. This occurs
+ when the client is exiting and is part of the final library cleanup routine.
+ Closes #1246.
+
 
 1.6.1 - 20190426
 ================

diff --git a/lib/net_mosq.c b/lib/net_mosq.c
@@ -107,6 +107,7 @@ static void cleanup_ui_method(void)
 {
  if(_ui_method){
  UI_destroy_method(_ui_method);
+ _ui_method = NULL;
  }
 }