bin/57630: vi coredump

[Simon Burge <simonb%NetBSD.org@localhost>]

>Number:         57630
>Category:       bin
>Synopsis:       vi coredump
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 26 07:20:01 +0000 2023
>Originator:     Simon Burge
>Release:        NetBSD 9.99.101
>Organization:
Disorganised
>Environment:
System: NetBSD thoreau.thistledown.com.au 9.99.101 NetBSD 9.99.101 (THOREAU.git) #58: Sun Oct 23 22:10:19 AEDT 2022 simonb%thoreau.thistledown.com.au@localhost:/NetBSD/netbsd-zfsboot-git/sys/arch/amd64/compile/THOREAU amd64
Architecture: x86_64
Machine: amd64
>Description:
	vi segfaults, apparently trying to do a null pointer deref.
>How-To-Repeat:
	1. Start vi.
	2. Type a <esc>
	3. Type :%s/^  <enter>
	4. See vi segfault.
>Fix:
	None given.
	pkgsrc/editors/nvi 1.81.6 doesn't appear to have this problem.

>Unformatted:
 	Confirmed on multiple NetBSD releases with multiple architectures.
 	Also occurs on FreeBSD's nvi