driver: Fix return check of dev_request_mem_region

dev_request_mem_region returns an ERR_PTR, fix places which check for a
NULL pointer instead. This patch has been generated with this semantic
patch, written by me and improved by Andrey Smirnov:

// <smpl>
@@
expression e;
expression e1;
@@
e = dev_request_mem_region(...);
...
-if (!e)
-	return e1;
+if (IS_ERR(e))
+	return PTR_ERR(e);

@ rule1 @
expression e;
@@
e = dev_request_mem_region(...);

@@
expression rule1.e;
identifier ret, label;
constant errno;
@@
if (!e) {
	...
(
-	ret = -errno;
+	ret = PTR_ERR(e);
	...
	goto label;
|
-	return -errno;
+	return PTR_ERR(e);
)
}

@depends on rule1@
expression rule1.e;
@@
-	if (e == NULL)
+	if (IS_ERR(e))
{
...
}
// </smpl>

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>

2 files changed, 4 insertions, 4 deletions

diff --git a/drivers/video/imx-ipu-v3/imx-hdmi.c b/drivers/video/imx-ipu-v3/imx-hdmi.c
index 25fcb0c739..49cbca16e6 100644
--- a/drivers/video/imx-ipu-v3/imx-hdmi.c
+++ b/drivers/video/imx-ipu-v3/imx-hdmi.c
@@ -1294,8 +1294,8 @@ static int dw_hdmi_probe(struct device_d *dev)
 	hdmi->ddc_node = of_parse_phandle(np, "ddc-i2c-bus", 0);
 
 	hdmi->regs = dev_request_mem_region(dev, 0);
-	if (!hdmi->regs)
-		return -EBUSY;
+	if (IS_ERR(hdmi->regs))
+		return PTR_ERR(hdmi->regs);
 
 	hdmi->isfr_clk = clk_get(hdmi->dev, "isfr");
 	if (IS_ERR(hdmi->isfr_clk)) {
diff --git a/drivers/video/imx-ipu-v3/ipu-common.c b/drivers/video/imx-ipu-v3/ipu-common.c
index 70bb0e59b6..398eefbd5b 100644
--- a/drivers/video/imx-ipu-v3/ipu-common.c
+++ b/drivers/video/imx-ipu-v3/ipu-common.c
@@ -761,8 +761,8 @@ static int ipu_probe(struct device_d *dev)
 		return ret;
 
 	ipu_base = dev_request_mem_region(dev, 0);
-	if (!ipu_base)
-		return -EBUSY;
+	if (IS_ERR(ipu_base))
+		return PTR_ERR(ipu_base);
 
 	ipu = xzalloc(sizeof(*ipu));