usb: gadget: gadgetfs: Free memory allocated by memdup_user()

Commit 3b74c73 switched over to memdup_user()
in ep_write() function and removed kfree (kbuf).
memdup_user() function allocates memory which is never freed.

Fixes: 3b74c73 (usb: gadget: inode: switch over to memdup_user())
Cc: <[email protected]> # v3.15+
Signed-off-by: Mario Schuknecht <[email protected]>
Signed-off-by: Felipe Balbi <[email protected]>

drivers/usb/gadget/legacy/inode.c

@@ -449,6 +449,7 @@ ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 		data->name, len, (int) value);
 free1:
 	mutex_unlock(&data->lock);
+	kfree (kbuf);
 	return value;
 }