rebase: drop unused p2 arg from rebasenode

hgext/rebase.py

@@ -171,7 +171,7 b' def rebase(ui, repo, **opts):'
                 else:
                     try:
                         ui.setconfig('ui', 'forcemerge', opts.get('tool', ''))
-                        stats = rebasenode(repo, rev, p1, p2, state)
+                        stats = rebasenode(repo, rev, p1, state)
                         if stats and stats[3] > 0:
                             raise util.Abort(_('unresolved conflicts (see hg '
                                         'resolve, then hg rebase --continue)'))
@@ -287,7 +287,7 b' def concludenode(repo, rev, p1, p2, comm'
         repo.dirstate.invalidate()
         raise
 
-def rebasenode(repo, rev, p1, p2, state):
+def rebasenode(repo, rev, p1, state):
     'Rebase a single revision'
     # Merge phase
     # Update to target and merge it with local