Don't crash if failing to bind a port.

src/libraries/libisc-new/ChangeLog

+2003-08-22  Per Cederqvist  <ceder@ceder.dyndns.org>
+
+	Don't crash if failing to bind a port.
+	* src/isc_session.c (isc_destroy): Don't chanse a NULL pointer.
+	This could be triggered if the port was already bound.
+
 2003-08-15  Per Cederqvist  <ceder@ceder.dyndns.org>
 
 	Get a fresh version of depcomp.