[or-cvs] fix another segv, this time in circid fix.

[nickm@xxxxxxxx (Nick Mathewson)]

Update of /home/or/cvsroot/tor/src/or
In directory moria:/tmp/cvs-serv16897/src/or

Modified Files:
	circuitlist.c 
Log Message:
fix another segv, this time in circid fix.

Index: circuitlist.c
===================================================================
RCS file: /home/or/cvsroot/tor/src/or/circuitlist.c,v
retrieving revision 1.65
retrieving revision 1.66
diff -u -d -r1.65 -r1.66
--- circuitlist.c	25 Oct 2005 07:05:03 -0000	1.65
+++ circuitlist.c	25 Oct 2005 15:31:25 -0000	1.66
@@ -394,7 +394,7 @@
 circuit_get_by_circid_orconn(uint16_t circ_id, connection_t *conn)
 {
   circuit_t *circ = circuit_get_by_circid_orconn_impl(circ_id, conn);
-  if (circ->marked_for_close)
+  if (!circ || circ->marked_for_close)
     return NULL;
   else
     return circ;