rebase: reorder parent check and state storage

This could cause a rebase to be 'in progress' even though it aborted.

hgext/rebase.py

@@ -258,10 +258,10 b' def rebase(ui, repo, **opts):'
             if state[rev] == -1:
                 ui.progress(_("rebasing"), pos, ("%d:%s" % (rev, repo[rev])),
                             _('changesets'), total)
+                p1, p2 = defineparents(repo, rev, target, state,
+                                                        targetancestors)
                 storestatus(repo, originalwd, target, state, collapsef, keepf,
                             keepbranchesf, external, activebookmark)
-                p1, p2 = defineparents(repo, rev, target, state,
-                                                        targetancestors)
                 if len(repo.parents()) == 2:
                     repo.ui.debug('resuming interrupted rebase\n')
                 else: