shelve: remove redundant acquisition of wlock for sub commands of unshelve

Previous patch ensures that wlock is acquired before processing for
"hg unshelve". It makes acquisition of wlock in each functions below
redundant.

  - unshelveabort() for "unshelve --abort"
  - unshelvecontinue() for "unshelve --continue"

hgext/shelve.py

@@ -473,7 +473,6 b' def pathtofiles(repo, files):'
 
 def unshelveabort(ui, repo, state, opts):
     """subcommand that abort an in-progress unshelve"""
-    wlock = repo.wlock()
     lock = None
     try:
         checkparents(repo, state)
@@ -497,7 +496,7 b' def unshelveabort(ui, repo, state, opts)'
     finally:
         shelvedstate.clear(repo)
         ui.warn(_("unshelve of '%s' aborted\n") % state.name)
-        lockmod.release(lock, wlock)
+        lockmod.release(lock)
 
 def mergefiles(ui, repo, wctx, shelvectx):
     """updates to wctx and merges the changes from shelvectx into the
@@ -533,7 +532,6 b' def unshelvecontinue(ui, repo, state, op'
     """subcommand to continue an in-progress unshelve"""
     # We're finishing off a merge. First parent is our original
     # parent, second is the temporary "fake" commit we're unshelving.
-    wlock = repo.wlock()
     lock = None
     try:
         checkparents(repo, state)
@@ -571,7 +569,7 b' def unshelvecontinue(ui, repo, state, op'
         unshelvecleanup(ui, repo, state.name, opts)
         ui.status(_("unshelve of '%s' complete\n") % state.name)
     finally:
-        lockmod.release(lock, wlock)
+        lockmod.release(lock)
 
 @command('unshelve',
          [('a', 'abort', None,