spi: orion: Fix return value check in orion_spi_probe()

In case of error, the function devm_ioremap() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check should
be replaced with NULL test.
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-orion.c

@@ -655,8 +655,8 @@ static int orion_spi_probe(struct platform_device *pdev)
 		spi->direct_access[cs].vaddr = devm_ioremap(&pdev->dev,
 							    r->start,
 							    PAGE_SIZE);
-		if (IS_ERR(spi->direct_access[cs].vaddr)) {
-			status = PTR_ERR(spi->direct_access[cs].vaddr);
+		if (!spi->direct_access[cs].vaddr) {
+			status = -ENOMEM;
 			goto out_rel_clk;
 		}
 		spi->direct_access[cs].size = PAGE_SIZE;