staging: lustre: Convert seq_ hash functions to return void

These functions don't need to return anything.
No caller uses the return value.

Miscellanea:

Integrate the individual strings to reduce object size ~100 bytes.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Oleg Drokin <oleg.drokin@intel.com>
Cc: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>