* hurd/hurdinit.c (_hurd_ports_use): Return error _hurd_ports is null.

* hurd/hurdinit.c (_hurd_ports_use): Return error _hurd_ports is null.

	* hurd/hurdsig.c (_hurdsig_init): Conditionalize exception port setup
	for old CMU and new OSF Mach interface flavors.
	* hurd/hurdfault.c (_hurdsig_fault_init): Likewise.
	* sysdeps/mach/hurd/fork.c (__fork): Likewise.

	* hurd/hurdsig.c (_hurd_internal_post_signal): Leave msgh_seqno unset.

	* sysdeps/mach/hurd/spawni.c (__spawni) [KERN_INVALID_LEDGER]:
	Pass extra arguments to task_create for OSF variant.
	* sysdeps/mach/hurd/fork.c (__fork): Likewise.