parisc: single_open() leaks

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/parisc/kernel/pdc_chassis.c

@@ -275,7 +275,7 @@ static const struct file_operations pdc_chassis_warn_fops = {
 	.open		= pdc_chassis_warn_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= seq_release,
+	.release	= single_release,
 };
 
 static int __init pdc_chassis_create_procfs(void)