ds1620: single_open() leak

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

drivers/char/ds1620.c

@@ -355,7 +355,7 @@ static const struct file_operations ds1620_proc_therm_fops = {
 	.open		= ds1620_proc_therm_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
-	.release	= seq_release,
+	.release	= single_release,
 };
 #endif