nvi bug fixing: memory use after free

[Matthew Dillon]

:Hi all,
:
:nvi's "memory use after free" bug exists in following call path:
:v_switch()->ex_edit()->set_alt_name()
:
:Following patch fixes above bug:
:http://leaf.dragonflybsd.org/~sephe/nvi.diff
:
:The patch file is obtained from OpenBSD.
:
:Not quite sure whether this is the correct way to patch our contrib source.
:Please review it.
:
:Best Regards,
:sephe

    Looks good, I've committed it.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>