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>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 74d89133f768..2b7dd88fc54f 100644
--- 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;
         }