[PATCH] btrfs: fix reversed warning condition in btrfs_delayed_inode_reserve_metadata

[David Sterba <dsterba@suse.cz>]

Commit fae7f21cece9a4c181 ("btrfs: Use WARN_ON()'s return value in place of
WARN_ON(1)") cleaned up WARN_ON usage and in one place reversed the condition
that led to loads of warnings that were not supposed to occur.

WARN_ON will trigger because it sees 'ret' though in the previous code
did not reach the WARN_ON below. The correct pattern is

-       if (condition)
+       if (WARN_ON(condition))

CC: Dulshani Gunawardhana <dulshani.gunawardhana89@gmail.com>
CC: <stable@vger.kernel.org> # 3.13
Reported-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
---
 fs/btrfs/delayed-inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 451b00c86f6c..098af20abd88 100644
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -649,7 +649,7 @@ static int btrfs_delayed_inode_reserve_metadata(
 			goto out;
 
 		ret = btrfs_block_rsv_migrate(src_rsv, dst_rsv, num_bytes);
-		if (!WARN_ON(ret))
+		if (WARN_ON(!ret))
 			goto out;
 
 		/*
-- 
1.9.0