Merge ipx_input.c:1.54 from HEAD to RELENG_6:

Comment that raw output filter code for IPX should run in a netisr so as
  to avoid recursing the socket code, as this input path can run in the
  call stack of an output path.

sys/netipx/ipx_input.c

@@ -447,6 +447,10 @@ register struct route *ro;
 	}
 }
 
+/*
+ * XXXRW: This code should be run in its own netisr dispatch to avoid a call
+ * back into the socket code from the IPX output path.
+ */
 void
 ipx_watch_output(m, ifp)
 struct mbuf *m;