lightnvm: move rq->error to nvm_rq->error

Instead of passing request error into the LightNVM modules, incorporate
it into the nvm_rq.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/lightnvm/gennvm.c

@@ -363,11 +363,11 @@ static void gennvm_mark_blk_bad(struct nvm_dev *dev, struct nvm_rq *rqd)
 		gennvm_blk_set_type(dev, &rqd->ppa_addr, 2);
 }
 
-static void gennvm_end_io(struct nvm_rq *rqd, int error)
+static void gennvm_end_io(struct nvm_rq *rqd)
 {
 	struct nvm_tgt_instance *ins = rqd->ins;
 
-	switch (error) {
+	switch (rqd->error) {
 	case NVM_RSP_SUCCESS:
 	case NVM_RSP_ERR_EMPTYPAGE:
 		break;
@@ -375,7 +375,7 @@ static void gennvm_end_io(struct nvm_rq *rqd, int error)
 		gennvm_mark_blk_bad(rqd->dev, rqd);
 	}
 
-	ins->tt->end_io(rqd, error);
+	ins->tt->end_io(rqd);
 }
 
 static int gennvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)