staging: lustre: ldlm: remove 'flags' arg from ldlm_flock_destroy()

The only value ever passed in LDLM_FL_WAIT_NOREPROC, so assume that
instead of passing it.

Signed-off-by: NeilBrown <neilb@suse.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>