LU-10643 ptlrpc: ptlrpc_register_bulk() LBUG on ENOMEM

LU-10643 ptlrpc: ptlrpc_register_bulk() LBUG on ENOMEM

Assertion fails on !desc->bd_registered during
retry after ENOMEM.

Drop bd_registered flag and exit via cleanup_bulk
to ensure that bulk is fully unregistered.

Cray-bug-id: MRP-4733
Change-Id: I51be5ec041ef903040bf8508156da8079511c9f7
Signed-off-by: Andriy Skulysh <c17819@cray.com>
Reviewed-on: https://review.whamcloud.com/31228
Reviewed-by: Alexandr Boyko <c17825@cray.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andrew Perepechko <c17827@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>