staging/lustre/fid: seq_client_init/fini don't need to be exported

In fact they could be static as they are only used inside
this file, so remove EXPORT_SYMBOL and declarations.
Also seq_client_init is always called with srv = NULL, so just
drop this argument.

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>