btrfs: check return value of btrfs_start_ioctl_transaction() properly

btrfs_start_ioctl_transaction() returns ERR_PTR(), not NULL.
So, it is necessary to use IS_ERR() to check the return value.

Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 04b4fb9..12dabe2 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -2085,7 +2085,7 @@ static long btrfs_ioctl_trans_start(struct file *file)
 
        ret = -ENOMEM;
        trans = btrfs_start_ioctl_transaction(root, 0);
-       if (!trans)
+       if (IS_ERR(trans))
                goto out_drop;
 
        file->private_data = trans;