cpufreq: qcom-hw: Fix return value check in qcom_cpufreq_hw_cpu_init()

In case of error, the function ioremap() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: 67fc209b527d ("cpufreq: qcom-hw: drop devm_xxx() calls from init/exit hooks")
Reported-by: Hulk Robot <[e-mail]>
Signed-off-by: Wei Yongjun <[e-mail]>
Acked-by: Shawn Guo <[e-mail]>
Signed-off-by: Viresh Kumar <[e-mail]>

drivers/cpufreq/qcom-cpufreq-hw.c

···
 	}
 
 	base = ioremap(res->start, resource_size(res));
-	if (IS_ERR(base)) {
+	if (!base) {
 		dev_err(dev, "failed to map resource %pR\n", res);
-		ret = PTR_ERR(base);
+		ret = -ENOMEM;
 		goto release_region;
 	}