soc: ti: k3-ringacc: Use correct error casting in k3_ringacc_dmarings_init

Use ERR_CAST() when devm_ioremap_resource() fails.
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20201214065421.5138-1-peter.ujfalusi@ti.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soc/ti/k3-ringacc.c

@@ -1476,7 +1476,7 @@ struct k3_ringacc *k3_ringacc_dmarings_init(struct platform_device *pdev,
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ringrt");
 	base_rt = devm_ioremap_resource(dev, res);
 	if (IS_ERR(base_rt))
-		return base_rt;
+		return ERR_CAST(base_rt);
 
 	ringacc->rings = devm_kzalloc(dev,
 				      sizeof(*ringacc->rings) *