Clean up unused-but-set-variable spotted by gcc-4.9.

Reviewed by:	mav
Approved by:	rodrigc (mentor)
MFC after:	2 weeks
Sponsored by:	gandi.net
Differential Revision:	https://reviews.freebsd.org/D5109

sys/cam/scsi/scsi_pass.c

@@ -773,9 +773,6 @@ passclose(struct cdev *dev, int flag, int fmt, struct thread *td)
 
 	if (softc->open_count == 0) {
 		struct pass_io_req *io_req, *io_req2;
-		int need_unlock;
-
-		need_unlock = 0;
 
 		TAILQ_FOREACH_SAFE(io_req, &softc->done_queue, links, io_req2) {
 			TAILQ_REMOVE(&softc->done_queue, io_req, links);

sys/cam/scsi/scsi_sa.c

@@ -4961,10 +4961,6 @@ sasetpos(struct cam_periph *periph, int hard, struct mtlocate *locate_info)
 			       /*sense_len*/ SSD_FULL_SIZE,
 			       /*timeout*/ SPACE_TIMEOUT);
 	} else {
-		uint32_t blk_pointer;
-
-		blk_pointer = locate_info->logical_id;
-
 		scsi_locate_10(&ccb->csio,
 			       /*retries*/ 1,
 			       /*cbfcnp*/ sadone,