don't leak almost 200 bytes for each new channel (issue #6330)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@8619 65c4cc65-6c06-0410-ace0-fbb531ad65f3

utils/astman.c

@@ -111,6 +111,7 @@ static void del_chan(char *name)
 				prev->next = chan->next;
 			else
 				chans = chan->next;
+			free(chan);
 			return;
 		}
 		prev = chan;