rebase: remove unnecessary confirm block

Removed unnecessary 'if confirm:' block as that thing is now
handled at 'finally'.

Differential Revision: https://phab.mercurial-scm.org/D3945

hgext/rebase.py

@@ -867,11 +867,6 b' def _dryrunrebase(ui, repo, opts):'
                             leaveunfinished=True)
         except error.InMemoryMergeConflictsError:
             ui.status(_('hit a merge conflict\n'))
-            if confirm:
-                # abort as in-memory merge doesn't support conflict
-                rbsrt._prepareabortorcontinue(isabort=True, backup=False,
-                                              suppwarns=True)
-                needsabort = False
             return 1
         else:
             if confirm: