HID: asus: simplify and improve asus_kbd_set_report()

Make the function shorter and easier to read using __free, and also fix a
misaligned comment closing tag.

The __free macro from cleanup.h is already used in the driver, but its
include is missing: add it.

Signed-off-by: Denis Benato <denis.benato@linux.dev>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: NeroReflex

drivers/hid/hid-asus.c

@@ -21,6 +21,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/cleanup.h>
 #include <linux/dmi.h>
 #include <linux/hid.h>
 #include <linux/module.h>
@@ -464,23 +465,16 @@ static int asus_raw_event(struct hid_device *hdev,
 
 static int asus_kbd_set_report(struct hid_device *hdev, const u8 *buf, size_t buf_size)
 {
-	unsigned char *dmabuf;
-	int ret;
-
-	dmabuf = kmemdup(buf, buf_size, GFP_KERNEL);
+	u8 *dmabuf __free(kfree) = kmemdup(buf, buf_size, GFP_KERNEL);
 	if (!dmabuf)
 		return -ENOMEM;
 
 	/*
 	 * The report ID should be set from the incoming buffer due to LED and key
 	 * interfaces having different pages
-	*/
-	ret = hid_hw_raw_request(hdev, buf[0], dmabuf,
-				 buf_size, HID_FEATURE_REPORT,
-				 HID_REQ_SET_REPORT);
-	kfree(dmabuf);
-
-	return ret;
+	 */
+	return hid_hw_raw_request(hdev, buf[0], dmabuf, buf_size, HID_FEATURE_REPORT,
+				  HID_REQ_SET_REPORT);
 }
 
 static int asus_kbd_init(struct hid_device *hdev, u8 report_id)