Use the helper introduced by commit 
e135303bd5bebcd2 ("device: Add
dev_<level>_once variants") instead of open-coding the same
functionality.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
 
 
                ret = sh_msiof_dma_once(p, tx_buf, rx_buf, l);
                if (ret == -EAGAIN) {
-                       pr_warn_once("%s %s: DMA not available, falling back to PIO\n",
-                                    dev_driver_string(&p->pdev->dev),
-                                    dev_name(&p->pdev->dev));
+                       dev_warn_once(&p->pdev->dev,
+                               "DMA not available, falling back to PIO\n");
                        break;
                }
                if (ret)