Readability changes in _crypto_operation() as suggested in a previous review. Change-Id: I8e71be297ae42d78e5c98302838625b80f319848 Signed-off-by: paul luse <paul.e.luse@intel.com> Reviewed-on: https://review.gerrithub.io/426598 Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>