[PATCH 02/49] dtoc: Use None to mean stdout

[Simon Glass]

At present dtoc uses '-' internally to mean that output should go to
stdout. This is not necessary and None is more convenient. Update it.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 tools/dtoc/dtb_platdata.py | 10 +++++-----
 tools/dtoc/main.py         |  2 +-
 tools/dtoc/test_dtoc.py    |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

Applied to u-boot-dm/next, thanks!