when index_init() or rnd_init() return an error, we still set
handler->inited to INDEX or RND in ha_index_init and ha_rnd_init.
As caller doesn't call ha_*_end() in this case, we get DBUG_ASSERT
failed.


sql/handler.h:
  Bug #29252 Assertion 'table->file || table->file->inited == handler::NONE' failed.
  
  make sure that 'inited' is handler::NONE if index_init() or rnd_init()
  returned an error