Btrfs: tests: checking for NULL instead of IS_ERR()

btrfs_alloc_dummy_root() return an error pointer on failure, it never
returns NULL.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/fs/btrfs/tests/free-space-tests.c b/fs/btrfs/tests/free-space-tests.c
index c8c3d70c31ff..8b72b005bfb9 100644
--- a/fs/btrfs/tests/free-space-tests.c
+++ b/fs/btrfs/tests/free-space-tests.c
@@ -898,8 +898,10 @@ int btrfs_test_free_space_cache(void)
         }
 
         root = btrfs_alloc_dummy_root();
-        if (!root)
+        if (IS_ERR(root)) {
+                ret = PTR_ERR(root);
                 goto out;
+        }
 
         root->fs_info = btrfs_alloc_dummy_fs_info();
         if (!root->fs_info)