staging: lustre: add missing blank line after declarations

Fixes checkpatch.pl WARNING:LINE_SPACING: Missing a blank line after
declarations.
The patch is generated using checkpatch.pl --fix-inplace:

for f in $(find drivers/staging/lustre/ -type f) ; do
    ./scripts/checkpatch.pl --types "LINE_SPACING" --test-only=Missing \
    --fix-inplace -f $f
done

Signed-off-by: Mike Rapoport <mike.rapoport@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>