Staging: lustre: lnet: selftest: Remove space after the name of that function

Fix checkpatch.pl issues with "space prohibited between function name
and open parenthesis" in rpc.c
Signed-off-by: Hatice ERTURK <haticeerturk27@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>