[PATCH] staging: fbtft: check return value of device_create_file()

[Harshit Shaw <shawharshit116@gmail.com>]

device_create_file() can fail but its return value was being
ignored in fbtft_sysfs_init(). Check the return value and
emit a warning if sysfs file creation fails.

Signed-off-by: Harshit Shaw <shawharshit116@gmail.com>
---
 drivers/staging/fbtft/fbtft-sysfs.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/fbtft/fbtft-sysfs.c b/drivers/staging/fbtft/fbtft-sysfs.c
index d05599d80011..cc6dbaeb6043 100644
--- a/drivers/staging/fbtft/fbtft-sysfs.c
+++ b/drivers/staging/fbtft/fbtft-sysfs.c
@@ -204,14 +204,21 @@ static struct device_attribute debug_device_attr =
 void fbtft_sysfs_init(struct fbtft_par *par)
 {
 	struct device *dev;
+	int ret;
 
 	dev = dev_of_fbinfo(par->info);
 	if (!dev)
 		return;
 
-	device_create_file(dev, &debug_device_attr);
-	if (par->gamma.curves && par->fbtftops.set_gamma)
-		device_create_file(dev, &gamma_device_attrs[0]);
+	ret = device_create_file(dev, &debug_device_attr);
+	if (ret)
+		dev_warn(dev, "failed to create debug sysfs entry\n");
+
+	if (par->gamma.curves && par->fbtftops.set_gamma) {
+		ret = device_create_file(dev, &gamma_device_attrs[0]);
+		if (ret)
+			dev_warn(dev, "failed to create gamma sysfs entry\n");
+	}
 }
 
 void fbtft_sysfs_exit(struct fbtft_par *par)
-- 
2.53.0