py3: use pycompat.maplist() instead of map()

Differential Revision: https://phab.mercurial-scm.org/D1558

mercurial/dispatch.py

@@ -913,7 +913,7 b' def _dispatch(req):'
                     if not func.optionalrepo:
                         if func.inferrepo and args and not path:
                             # try to infer -R from command args
-                            repos = map(cmdutil.findrepo, args)
+                            repos = pycompat.maplist(cmdutil.findrepo, args)
                             guess = repos[0]
                             if guess and repos.count(guess) == len(repos):
                                 req.args = ['--repository', guess] + fullargs