[PATCH] u_boot_pylib: Ensure subprocess is closed down

[Simon Glass]

It isn't clear why we need to have two different paths for closing down
the pipe. Unify them and use the Python to avoid this warning:

  subprocess.py:1127: ResourceWarning: subprocess 83531 is still running

Note that this code appears to originally have come from [1] and was
committed into the ChromeOS chromiumos/platform/crosutils repo in the
bin/cros_image_to_target.py file. The addition of the extra code path
came later, so that is chosen for the fixes tag.

[1] https://codereview.chromium.org/3391008

Signed-off-by: Simon Glass <sjg at chromium.org>
Fixes: a10fd93cbc patman: Make command methods return a CommandResult
---

 tools/u_boot_pylib/command.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Applied to u-boot-dm, thanks!