Merged revisions 330581 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.8

........
  r330581 | dvossel | 2011-08-02 11:15:08 -0500 (Tue, 02 Aug 2011) | 8 lines
  
  Fixes crash in chan_iax2.
  
  Fixes crash in chan_iax2 resulting from an edge case in the
  way control frames are queued during calltoken negotiation is complete.
  
  (closes issue ASTERISK-17610)
  Reported by: mgrobecker
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@330586 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -1898,7 +1898,9 @@ static int scheduled_destroy(const void *vid)
 
 static void free_signaling_queue_entry(struct signaling_queue_entry *s)
 {
-	ast_free(s->f.data.ptr);
+	if (s->f.datalen) {
+		ast_free(s->f.data.ptr);
+	}
 	ast_free(s);
 }