rebase: refer to dirstateguard by its new name

hgext/rebase.py

@@ -32,6 +32,7 b' from mercurial import ('
     commands,
     copies,
     destutil,
+    dirstateguard,
     error,
     extensions,
     hg,
@@ -790,7 +791,7 b' def concludenode(repo, rev, p1, p2, comm'
     '''Commit the wd changes with parents p1 and p2. Reuse commit info from rev
     but also store useful information in extra.
     Return node of committed revision.'''
-    dsguard = cmdutil.dirstateguard(repo, 'rebase')
+    dsguard = dirstateguard.dirstateguard(repo, 'rebase')
     try:
         repo.setparents(repo[p1].node(), repo[p2].node())
         ctx = repo[rev]