staging: lustre: lustre: ptlrpc: Remove unnecessary braces

Fixes the following checkpatch warning:
WARNING: braces {} are not necessary for single statement blocks

Signed-off-by: Balavasu Kuppusammyprathaban <kp.balavasu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>