ieee802154: at86rf230: convert to DEFINE_SHOW_ATTRIBUTE

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: Yangtao Li <tiny.windzz@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ieee802154/at86rf230.c

@@ -1632,18 +1632,7 @@ static int at86rf230_stats_show(struct seq_file *file, void *offset)
 	seq_printf(file, "INVALID:\t\t%8llu\n", lp->trac.invalid);
 	return 0;
 }
-
-static int at86rf230_stats_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, at86rf230_stats_show, inode->i_private);
-}
-
-static const struct file_operations at86rf230_stats_fops = {
-	.open		= at86rf230_stats_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(at86rf230_stats);
 
 static int at86rf230_debugfs_init(struct at86rf230_local *lp)
 {