hg: code-tools/jcheck: 7902421: jcheck fails with mercurial 4.8 with TypeError: walkchangerevs() takes exactly 4 arguments (5 given)

[jonathan.gibbons at oracle.com]

Changeset: 4ac08a4210ec
Author:    jjg
Date:      2019-05-29 10:25 -0700
URL:       http://hg.openjdk.java.net/code-tools/jcheck/rev/4ac08a4210ec

7902421: jcheck fails with mercurial 4.8 with TypeError: walkchangerevs() takes exactly 4 arguments (5 given)
Reviewed-by: erikj
Contributed-By: gnu.andrew at redhat.com

! jcheck.py