[SG] Update drivers to use sg helpers

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index 402209f..282a6955 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -522,6 +522,7 @@
 			host->n_msgs++;
 
 			assert(host->n_msgs <= CARM_MAX_REQ);
+			sg_init_table(crq->sg, CARM_MAX_REQ_SG);
 			return crq;
 		}