[PATCH] mailbox: Fix devm_ioremap_resource error detection code

[Amitoj Kaur Chawla]

devm_ioremap_resource returns an ERR_PTR value, not NULL, 
on failure.

The Coccinelle semantic patch used to make this change is 
as follows:
@@
expression e,e1;
statement S;
@@

*e = devm_ioremap_resource(...);
if (!e1) S

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@xxxxxxxxx>
---
 drivers/mailbox/mailbox-sti.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mailbox/mailbox-sti.c b/drivers/mailbox/mailbox-sti.c
index 2394cfe..a334db5 100644
--- a/drivers/mailbox/mailbox-sti.c
+++ b/drivers/mailbox/mailbox-sti.c
@@ -430,8 +430,8 @@ static int sti_mbox_probe(struct platform_device *pdev)
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	mdev->base = devm_ioremap_resource(&pdev->dev, res);
-	if (!mdev->base)
-		return -ENOMEM;
+	if (IS_ERR(mdev->base))
+		return PTR_ERR(mdev->base);
 
 	ret = of_property_read_string(np, "mbox-name", &mdev->name);
 	if (ret)
-- 
1.9.1