crypto: dcp - Check the return value from devm_ioremap_resource()

devm_ioremap_resource() may fail, so better check its return value and propagate
it in the case of error.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/dcp.c

@@ -734,6 +734,8 @@ static int dcp_probe(struct platform_device *pdev)
 
 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	dev->dcp_regs_base = devm_ioremap_resource(&pdev->dev, r);
+	if (IS_ERR(dev->dcp_regs_base))
+		return PTR_ERR(dev->dcp_regs_base);
 
 	dcp_set(dev, DCP_CTRL_SFRST, DCP_REG_CTRL);
 	udelay(10);