Only reset a CDR that exists.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@276126 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_features.c

@@ -2193,7 +2193,9 @@ int ast_bridge_call(struct ast_channel *chan,struct ast_channel *peer,struct ast
 				ast_channel_unlock(chan_ptr);
 			}
 			/* new channel */
-			ast_cdr_specialized_reset(new_peer_cdr,0);
+			if (new_peer_cdr) {
+				ast_cdr_specialized_reset(new_peer_cdr, 0);
+			}
 		} else {
 			ast_cdr_specialized_reset(peer->cdr, 0); /* nothing changed, reset the peer cdr  */
 		}