From 1f6e4b3f9f7c859fed7ac4c0853e976a1a752873 Mon Sep 17 00:00:00 2001
From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Tue, 5 May 2015 10:53:15 +0800
Subject: [PATCH] btrfs: Fix superblock csum type check.

Old csum type check is wrong and can't catch csum_type 1(not supported).

Fix it to avoid hostile 0 division.

Reported-by: Lukas Lueg <lukas.lueg@gmail.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
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Reading git-format-patch failed