[PATCH v1] bbdev: prevent clang 3.4.2 compilation error

[Thomas Monjalon]

> > Casting explicitly from enum to uint8_t to avoid compilation
> > warning with clang 3.4.2 -Wtautological-constant-out-of-range-compare
> > 
> > Signed-off-by: Nicolas Chautru <nicolas.chautru at intel.com>
> 
> Verified that the build passes with this patch. Thanks Nicolas.
> 
> Tested-by: Ali Alnubani <alialnu at nvidia.com>

Applied with more complete commit message, thanks:

bbdev: fix build with clang 3.4.2

Casting explicitly from enum to uint8_t to avoid compilation
warning with clang 3.4.2:

  rte_bbdev.c:1179:13: error:
  comparison of constant 4 with expression
  of type 'enum rte_bbdev_enqueue_status' is always true
  [-Werror,-Wtautological-constant-out-of-range-compare]

Bugzilla ID: 1095
Fixes: 1be86f2e94e4 ("bbdev: add device status info")
Fixes: 4f08028c5e24 ("bbdev: expose queue related warning and status")