D6850: bundle2: fix an off-by-one in debug message of number of parts

[marmoute (Pierre-Yves David)]

marmoute added a comment.
marmoute accepted this revision.


  Looks good to me

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D6850/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D6850

To: martinvonz, durin42, #hg-reviewers, marmoute
Cc: marmoute, mercurial-devel