spi: st-ssc4: use devm_platform_ioremap_resource() to simplify code

Use devm_platform_ioremap_resource() to simplify the code a bit.
This is detected by coccinelle.
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20190904135918.25352-29-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-st-ssc4.c

@@ -298,7 +298,6 @@ static int spi_st_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct spi_master *master;
-	struct resource *res;
 	struct spi_st *spi_st;
 	int irq, ret = 0;
 	u32 var;
@@ -331,8 +330,7 @@ static int spi_st_probe(struct platform_device *pdev)
 	init_completion(&spi_st->done);
 
 	/* Get resources */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	spi_st->base = devm_ioremap_resource(&pdev->dev, res);
+	spi_st->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(spi_st->base)) {
 		ret = PTR_ERR(spi_st->base);
 		goto clk_disable;