Merged revisions 44460 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.2

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r44460 | crichter | 2006-10-05 12:02:38 +0200 (Do, 05 Okt 2006) | 1 line

fixed segfault which happens during hold/transfer action
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@44563 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_misdn.c

@@ -3164,7 +3164,7 @@ static struct chan_list *find_chan_by_pid(struct chan_list *list, int pid)
 {
 	struct chan_list *help=list;
 	for (;help; help=help->next) {
-		if (help->bc->pid == pid) return help;
+		if ( help->bc && (help->bc->pid == pid) ) return help;
 	}
   
 	chan_misdn_log(6, 0, "$$$ find_chan: No channel found for pid:%d\n",pid);