largefiles: remove unused 'rev' parameter from downloadlfiles()

It's no longer used since 83ead8cb0ff2 "largefiles: implement pull
--all-largefiles as a special case of --lfrev."

hgext/largefiles/lfcommands.py

@@ -485,7 +485,7 b' def cachelfiles(ui, repo, node, filelist'
     return ([], [])
 
 
-def downloadlfiles(ui, repo, rev=None):
+def downloadlfiles(ui, repo):
     match = scmutil.match(repo[None], [repo.wjoin(lfutil.shortname)], {})
 
     def prepare(ctx, fns):
@@ -493,8 +493,7 b' def downloadlfiles(ui, repo, rev=None):'
 
     totalsuccess = 0
     totalmissing = 0
-    if rev != []:  # walkchangerevs on empty list would return all revs
-        for ctx in cmdutil.walkchangerevs(repo, match, {b'rev': rev}, prepare):
+    for ctx in cmdutil.walkchangerevs(repo, match, {b'rev': None}, prepare):
             success, missing = cachelfiles(ui, repo, ctx.node())
             totalsuccess += len(success)
             totalmissing += len(missing)

hgext/largefiles/overrides.py

@@ -1094,7 +1094,7 b' def hgclone(orig, ui, opts, *args, **kwa'
         # truncated at that point.  The user may expect a download count with
         # this option, so attempt whether or not this is a largefile repo.
         if opts.get(b'all_largefiles'):
-            success, missing = lfcommands.downloadlfiles(ui, repo, None)
+            success, missing = lfcommands.downloadlfiles(ui, repo)
 
             if missing != 0:
                 return None