[PATCH] video, udlfb: Fix two build warning about 'ignoring return value'

[Liu Yuan <namei.unix@gmail.com>]

From: Liu Yuan <tailai.ly@taobao.com>

Build warning:
...
drivers/video/udlfb.c:1590: warning: ignoring return value of ‘device_create_file’, declared with attribute warn_unused_result
drivers/video/udlfb.c:1592: warning: ignoring return value of ‘device_create_bin_file’, declared with attribute warn_unused_result

So add two checks to get rid of 'em.

Signed-off-by: Liu Yuan <tailai.ly@taobao.com>
---
 drivers/video/udlfb.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 68041d9..55d6de6 100644
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -1586,10 +1586,19 @@ static int dlfb_usb_probe(struct usb_interface *interface,
 		goto error;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
-		device_create_file(info->dev, &fb_device_attrs[i]);
+	for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {
+		retval = device_create_file(info->dev, &fb_device_attrs[i]);
+		if (retval) {
+			pr_err("device_create_file failed %d\n", retval);
+			goto error;
+		}
+	}
 
-	device_create_bin_file(info->dev, &edid_attr);
+	retval = device_create_bin_file(info->dev, &edid_attr);
+	if (retval) {
+		pr_err("device_create_bin_file failed %d\n", retval);
+		goto error;
+	}
 
 	pr_info("DisplayLink USB device /dev/fb%d attached. %dx%d resolution."
 			" Using %dK framebuffer memory\n", info->node,
-- 
1.7.1