unshelve: changed Corruptedstate error msg from ui.warn to error.Abort

This changes the message type of Corruptedstate error in case of `hg unshelve --abort`
to error.Abort from warning message. This is done so as to avoid the return statement
after the warning.

Differential Revision: https://phab.mercurial-scm.org/D6636

mercurial/shelve.py

@@ -880,12 +880,10 b' def dounshelve(ui, repo, *shelved, **opt'
                          'operation')
                 raise error.Abort(msg, hint=hint)
             elif abortf:
-                msg = _('could not read shelved state file, your working copy '
-                        'may be in an unexpected state\nplease update to some '
-                        'commit\n')
-                ui.warn(msg)
                 shelvedstate.clear(repo)
-            return
+                raise error.Abort(_('could not read shelved state file, your '
+                                 'working copy may be in an unexpected state\n'
+                                 'please update to some commit\n'))
 
         if abortf:
             return unshelveabort(ui, repo, state, opts)

tests/test-shelve2.t

@@ -696,8 +696,10 b' Unshelve --continue fails with appropria'
 
 Unshelve --abort works with a corrupted shelvedstate
   $ hg unshelve --abort
-  could not read shelved state file, your working copy may be in an unexpected state
+  abort: could not read shelved state file, your working copy may be in an unexpected state
   please update to some commit
+  
+  [255]
 
 Unshelve --abort fails with appropriate message if there's no unshelve in
 progress