staging: lustre: Align backslashes in multi-line macros

This patch right aligns all backslashes in multi-line macros
in obd_class.h for better readability.

Signed-off-by: Fabian Huegel <fabian_huegel@web.de>
Signed-off-by: Christoph Volkert <linux@christoph-volkert.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>