Btrfs: check btrfs_get_extent return for IS_ERR()

btrfs_get_extent() never returns NULL, only a valid pointer or ERR_PTR()

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 74d8913..2b7dd88 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -510,7 +510,7 @@ static int should_defrag_range(struct inode *inode, u64 start, u64 len,
                em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
                unlock_extent(io_tree, start, start + len - 1, GFP_NOFS);
 
-               if (!em)
+               if (IS_ERR(em))
                        return 0;
        }