staging: lustre: Add missing spaces around operators and braces.

Fixes the following checkpatch errors:

ERROR: space required after that ',' (ctx:VxV)
ERROR: space required after that close brace '}'

Signed-off-by: Srikrishan Malik <srikrishanmalik@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>