staging: lustre: lov: Cleanup style issues in lov_request.c

[Riccardo Lucchese]

Hello,

This patch series contains one cleanup and two coding style fixes for
lov_request.c.

This iteration addresses the review comments received by v2.

Changes in v3:
 - Renamed the local variable introduced in v2-1/3 to be consistent
   with other definitions in the driver.

Changes in v2:
 - Improved the commit messages.
 - Introduced a local variable in lov_check_set() to make the code
   clearer.

Thanks,
riccardo