rebase: remove bogus nullmerge check in updatebookmarks stable

rebase: remove bogus nullmerge check in updatebookmarks

nstate[v] is a node, not an int, and the nullmerge check was done while
building nstate anyway.

--- a/hgext/rebase.py	Tue Nov 27 21:31:59 2012 -0500
+++ b/hgext/rebase.py	Wed Jan 30 17:49:54 2013 -0800
@@ -498,9 +498,8 @@
     marks = repo._bookmarks
     for k, v in originalbookmarks.iteritems():
         if v in nstate:
-            if nstate[v] > nullmerge:
-                # update the bookmarks for revs that have moved
-                marks[k] = nstate[v]
+            # update the bookmarks for revs that have moved
+            marks[k] = nstate[v]
 
     marks.write()