[patch] Btrfs: tests: checking for NULL instead of IS_ERR()

[Dan Carpenter]

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

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/fs/btrfs/tests/free-space-tests.c 
b/fs/btrfs/tests/free-space-tests.c
index c8c3d70..8b72b00 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)
--
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