hg: fix error after reformat

vcsserver/remote/hg_remote.py

@@ -566,11 +566,12 b' class HgRemote(RemoteBase):'
 
             def history_iter():
                 limit_rev = fctx.rev()
+
                 for fctx_candidate in reversed(list(fctx.filelog())):
                     f_obj = fctx.filectx(fctx_candidate)
 
                     # NOTE: This can be problematic...we can hide ONLY history node resulting in empty history
-                    _ctx = obj.changectx()
+                    _ctx = f_obj.changectx()
                     if _ctx.hidden() or _ctx.obsolete():
                         continue