hw/block/nvme: commonize nvme_rw error handling

Move common error handling to a label.
Signed-off-by: NKlaus Jensen <k.jensen@samsung.com>
Reviewed-by: NKeith Busch <kbusch@kernel.org>

hw/block/nvme.c

@@ -687,20 +687,18 @@ static uint16_t nvme_rw(NvmeCtrl *n, NvmeRequest *req)
     status = nvme_check_mdts(n, data_size);
     if (status) {
         trace_pci_nvme_err_mdts(nvme_cid(req), data_size);
-        block_acct_invalid(blk_get_stats(n->conf.blk), acct);
-        return status;
+        goto invalid;
     }
 
     status = nvme_check_bounds(n, ns, slba, nlb);
     if (status) {
         trace_pci_nvme_err_invalid_lba_range(slba, nlb, ns->id_ns.nsze);
-        block_acct_invalid(blk_get_stats(n->conf.blk), acct);
-        return status;
+        goto invalid;
     }
 
-    if (nvme_map_dptr(n, data_size, req)) {
-        block_acct_invalid(blk_get_stats(n->conf.blk), acct);
-        return NVME_INVALID_FIELD | NVME_DNR;
+    status = nvme_map_dptr(n, data_size, req);
+    if (status) {
+        goto invalid;
     }
 
     if (req->qsg.nsg > 0) {
@@ -722,6 +720,10 @@ static uint16_t nvme_rw(NvmeCtrl *n, NvmeRequest *req)
     }
 
     return NVME_NO_COMPLETE;
+
+invalid:
+    block_acct_invalid(blk_get_stats(n->conf.blk), acct);
+    return status;
 }
 
 static uint16_t nvme_io_cmd(NvmeCtrl *n, NvmeRequest *req)