i2c: mlxbf: Fix the return check of devm_ioremap and ioremap

devm_ioremap and ioremap may return NULL which cannot be checked
by IS_ERR.

Signed-off-by: Wang Xiaojun <[e-mail]>
Reported-by: Hulk Robot <[e-mail]>
Acked-by: Khalil Blaiech <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>

drivers/i2c/busses/i2c-mlxbf.c

···
 		return -EFAULT;
 
 	gpio_res->io = devm_ioremap(dev, params->start, size);
-	if (IS_ERR(gpio_res->io)) {
+	if (!gpio_res->io) {
 		devm_release_mem_region(dev, params->start, size);
-		return PTR_ERR(gpio_res->io);
+		return -ENOMEM;
 	}
 
 	return 0;
···
 		return -EFAULT;
 
 	corepll_res->io = devm_ioremap(dev, params->start, size);
-	if (IS_ERR(corepll_res->io)) {
+	if (!corepll_res->io) {
 		devm_release_mem_region(dev, params->start, size);
-		return PTR_ERR(corepll_res->io);
+		return -ENOMEM;
 	}
 
 	return 0;
···
 			return -EFAULT;
 
 		coalesce_res->io = ioremap(params->start, size);
-		if (IS_ERR(coalesce_res->io)) {
+		if (!coalesce_res->io) {
 			release_mem_region(params->start, size);
-			return PTR_ERR(coalesce_res->io);
+			return -ENOMEM;
 		}
 
 		priv->coalesce = coalesce_res;