Don't retry lock if there is no channel

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1167 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/channels/chan_agent.c b/channels/chan_agent.c
index 0e90ac39bf8929448c9bbd8059ad04c5596afcaa..29dc13a5add30f09350d6c85ec2812dd37705a74 100755 (executable)
--- a/channels/chan_agent.c
+++ b/channels/chan_agent.c
@@ -438,10 +438,12 @@ static struct ast_channel *agent_new(struct agent_pvt *p, int state)
                p->app_sleep_cond = 0;
                if( pthread_mutex_trylock(&p->app_lock) )
                {
-                       ast_queue_frame(p->chan, &null_frame, 1);
-                       ast_pthread_mutex_unlock(&p->lock);     /* For other thread to read the condition. */
-                       ast_pthread_mutex_lock(&p->app_lock);
-                       ast_pthread_mutex_lock(&p->lock);
+                       if (p->chan) {
+                               ast_queue_frame(p->chan, &null_frame, 1);
+                               ast_pthread_mutex_unlock(&p->lock);     /* For other thread to read the condition. */
+                               ast_pthread_mutex_lock(&p->app_lock);
+                               ast_pthread_mutex_lock(&p->lock);
+                       }
                        if( !p->chan )
                        {
                                ast_log(LOG_WARNING, "Agent disconnected while we were connecting the call\n");