[PATCH] btrfs: tests: Fix an NULL vs IS_ERR() test

[Dan Carpenter <dan.carpenter@xxxxxxxxxx>]

The btrfs_alloc_dummy_device() function never returns NULL, it returns
error pointers.

Fixes: 5d9a4f871168 ("btrfs: Add self-tests for btrfs_rmap_block")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
 fs/btrfs/tests/extent-map-tests.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/tests/extent-map-tests.c b/fs/btrfs/tests/extent-map-tests.c
index b7f2c4398e92..70a2f0dc9a78 100644
--- a/fs/btrfs/tests/extent-map-tests.c
+++ b/fs/btrfs/tests/extent-map-tests.c
@@ -490,9 +490,9 @@ static int test_rmap_block(struct btrfs_fs_info *fs_info,
 	for (i = 0; i < map->num_stripes; i++) {
 		struct btrfs_device *dev = btrfs_alloc_dummy_device(fs_info);
 
-		if (!dev) {
+		if (IS_ERR(dev)) {
 			test_err("cannot allocate device");
-			ret = -ENOMEM;
+			ret = PTR_ERR(dev);
 			goto out;
 		}
 		map->stripes[i].dev = dev;
-- 
2.11.0