spi: sirf: 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/20190904135918.25352-28-yuehaibing@huawei.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-sirf.c

@@ -1070,7 +1070,6 @@ static int spi_sirfsoc_probe(struct platform_device *pdev)
 {
 	struct sirfsoc_spi *sspi;
 	struct spi_master *master;
-	struct resource *mem_res;
 	const struct sirf_spi_comp_data *spi_comp_data;
 	int irq;
 	int ret;
@@ -1097,8 +1096,7 @@ static int spi_sirfsoc_probe(struct platform_device *pdev)
 	sspi->fifo_level_chk_mask = (sspi->fifo_size / 4) - 1;
 	sspi->dat_max_frm_len = spi_comp_data->dat_max_frm_len;
 	sspi->fifo_size = spi_comp_data->fifo_size;
-	mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	sspi->base = devm_ioremap_resource(&pdev->dev, mem_res);
+	sspi->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(sspi->base)) {
 		ret = PTR_ERR(sspi->base);
 		goto free_master;