staging: lustre: include/lustre_net.h: Remove unnecessary space before function pointer arguments.

Minor warnings spotted by checkpatch.pl in lustre
Remove unnecessary space before function pointer arguments.

Signed-off-by: Richard Groux <rgroux@sauron-mordor.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>