scsi: hisi_sas: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.

Link: https://lore.kernel.org/r/20190904130256.24704-1-yuehaibing@huawei.comReported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Acked-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -2579,8 +2579,7 @@ static struct Scsi_Host *hisi_sas_shost_alloc(struct platform_device *pdev,
 		goto err_out;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	hisi_hba->regs = devm_ioremap_resource(dev, res);
+	hisi_hba->regs = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(hisi_hba->regs))
 		goto err_out;