Coresight: Fix a NULL vs IS_ERR() bug in probe

The devm_platform_get_and_ioremap_resource() function doesn't
return NULL, it returns error pointers.  Update the checking to
match.

Fixes: f78d206 ("Coresight: Add Coresight TMC Control Unit driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/dab039b9-d58a-41be-92f0-ff209cfabfe2@stanley.mountain

Author: Dan Carpenter

drivers/hwtracing/coresight/coresight-ctcu-core.c

@@ -204,8 +204,8 @@ static int ctcu_probe(struct platform_device *pdev)
 	dev->platform_data = pdata;
 
 	base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
-	if (!base)
-		return -ENOMEM;
+	if (IS_ERR(base))
+		return PTR_ERR(base);
 
 	drvdata->apb_clk = coresight_get_enable_apb_pclk(dev);
 	if (IS_ERR(drvdata->apb_clk))