hwmon: (iio_hwmon) fix memory leak in name attribute

BugLink: http://bugs.launchpad.net/bugs/1621113

commit 5d17d3b4 upstream.

The "name" variable's memory is now freed when the device is destructed
thanks to devm function.
Signed-off-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Fixes: e0f8a24e ("staging:iio::hwmon interface client driver.")
Fixes: 61bb53bc ("hwmon: (iio_hwmon) Add support for humidity sensors")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

drivers/hwmon/iio_hwmon.c

@@ -109,22 +109,22 @@ static int iio_hwmon_probe(struct platform_device *pdev)
 
 		switch (type) {
 		case IIO_VOLTAGE:
-			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
 							       "in%d_input",
 							       in_i++);
 			break;
 		case IIO_TEMP:
-			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
 							       "temp%d_input",
 							       temp_i++);
 			break;
 		case IIO_CURRENT:
-			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
 							       "curr%d_input",
 							       curr_i++);
 			break;
 		case IIO_HUMIDITYRELATIVE:
-			a->dev_attr.attr.name = kasprintf(GFP_KERNEL,
+			a->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
 							       "humidity%d_input",
 							       humidity_i++);
 			break;