D1099: dagutil: use a listcomp instead of a map()

[yuja (Yuya Nishihara)]

yuja added a comment.


  I have no preference, but pycompat.maplist() could be used.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D1099

To: durin42, #hg-reviewers, ryanmce
Cc: yuja, ryanmce, mercurial-devel