HID: fix incorrect free in hiddev

If hiddev_open() fails, it wrongly frees the shared hiddev structure
kept in hiddev_table instead of the hiddev_list structure allocated
for the opened file descriptor.  Existing references to this structure
will then accessed free memory.

This was introduced by 07903407 "HID: hiddev cleanup -- handle all
error conditions properly".
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Oliver Neukum <oliver@neukum.name>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/usbhid/hiddev.c

@@ -306,7 +306,7 @@ static int hiddev_open(struct inode *inode, struct file *file)
 	return 0;
 bail:
 	file->private_data = NULL;
-	kfree(list->hiddev);
+	kfree(list);
 	return res;
 }