MIPS: TXx9: 7segled: add missing put_device call

This is required so that we give up the last reference to the device.

Also, add a new tx_7segled_release function which will be called after the
put_device to ensure that device is kfree'd.

[ralf@linux-mips.org: Reformat to Linux coding style and make
tx_7segled_release static.]
Signed-off-by: Levente Kurusa <levex@linux.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/6260/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/txx9/generic/7segled.c

@@ -83,6 +83,11 @@ static struct bus_type tx_7segled_subsys = {
 	.dev_name	= "7segled",
 };
 
+static void tx_7segled_release(struct device *dev)
+{
+	kfree(dev);
+}
+
 static int __init tx_7segled_init_sysfs(void)
 {
 	int error, i;
@@ -103,12 +108,15 @@ static int __init tx_7segled_init_sysfs(void)
 		}
 		dev->id = i;
 		dev->bus = &tx_7segled_subsys;
+		dev->release = &tx_7segled_release;
 		error = device_register(dev);
-		if (!error) {
+		if (error) {
+			put_device(dev);
+			return error;
+		}
 		device_create_file(dev, &dev_attr_ascii);
 		device_create_file(dev, &dev_attr_raw);
 	}
-	}
 	return error;
 }