kern/52268: WAPBL journal entries aren't checksummed

[coypu%sdf.org@localhost]

>Number:         52268
>Category:       kern
>Synopsis:       WAPBL journal entries aren't checksummed
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jun 02 19:15:00 +0000 2017
>Originator:     coypu
>Release:        NetBSD 7.99.75
>Organization:
>Environment:
NetBSD loggy 7.99.75 NetBSD 7.99.75 (GENERIC) #61: Fri Jun  2 10:34:58 IDT 2017  fly@loggy:/home/fly/obj/sys/arch/amd64/compile/GENERIC amd64

>Description:
We have no way to detect a case where the journal entry is only partially written.
See XXX comment in wapbl_write_commit.
>How-To-Repeat:

>Fix: