push: set bkresult when pushing bookmarks through bundle2

mercurial/exchange.py

@@ -489,6 +489,8 b' def _pushb2bookmarks(pushop, bundler):'
                     pushop.ui.status(_("updating bookmark %s\n") % book)
                 else:
                     pushop.ui.warn(_('updating bookmark %s failed!\n') % book)
+                    if pushop.bkresult is not None:
+                        pushop.bkresult = 1
     return handlereply