soc: qcom: Fix a IS_ERR() vs NULL bug in probe

The devm_ioremap() function returns NULL on error, it never returns
error pointers.

Fixes: a77b2a0 ("soc: qcom: Introduce RPM master stats driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/ZH7sgpLAN23bCz9v@moroto

Author: Dan Carpenter

drivers/soc/qcom/rpm_master_stats.c

@@ -105,7 +105,7 @@ static int master_stats_probe(struct platform_device *pdev)
 		}
 
 		data[i].base = devm_ioremap(dev, res.start, resource_size(&res));
-		if (IS_ERR(data[i].base)) {
+		if (!data[i].base) {
 			debugfs_remove_recursive(root);
 			return dev_err_probe(dev, -EINVAL,
 					     "Could not map the MSG RAM slice idx %d!\n", i);