app_agent_pool: Fix AMI/CLI AgentLogoff soft preventing agents from logging back in.

* Clear the deferred_logoff flag when an agent logs in.

(closes issue ASTERISK-22669)
Reported by: John Bigelow
........

Merged revisions 400754 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@400759 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_agent_pool.c

@@ -2032,6 +2032,7 @@ static int agent_login_exec(struct ast_channel *chan, const char *data)
 	agent->logged = ast_channel_ref(chan);
 	agent->last_disconnect = ast_tvnow();
 	time(&agent->login_start);
+	agent->deferred_logoff = 0;
 	agent_unlock(agent);
 
 	agent_login_channel_config(agent, chan);