LU-8056 lprocfs: treat seq_printf as void function

LU-8056 lprocfs: treat seq_printf as void function

In newer kernels seq_printf is a void function. Some
of the seq_printf handle server side missed being
updated to treat seq_printf as a void function.

Change-Id: Icfd2f83ad4cd143eac228ed3d50beff533fcfe44
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: http://review.whamcloud.com/21453
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Kit Westneat <kit.westneat@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>