cmdutil: changed max method for lazy call

Used the lazy max call instead of the python max implementation to be able to
use lazysets for graphlog.

mercurial/cmdutil.py

@@ -1711,7 +1711,7 b' def graphlog(ui, repo, *pats, **opts):'
     if opts.get('copies'):
         endrev = None
         if opts.get('rev'):
-            endrev = max(scmutil.revrange(repo, opts.get('rev'))) + 1
+            endrev = scmutil.revrange(repo, opts.get('rev')).max() + 1
         getrenamed = templatekw.getrenamedfn(repo, endrev=endrev)
     displayer = show_changeset(ui, repo, opts, buffered=True)
     showparents = [ctx.node() for ctx in repo[None].parents()]