Add missing await for coroutine

[jjlawren]

Description:

Adds missing await for ffmpeg camera setup coroutine.

Fixes warnings on startup:

/srv/homeassistant/lib/python3.6/site-packages/homeassistant/components/camera/ffmpeg.py:35: RuntimeWarning: coroutine 'FFmpegManager.async_run_test' was never awaited
  if not hass.data[DATA_FFMPEG].async_run_test(config.get(CONF_INPUT)):

Related issue (if applicable): fixes #

Example entry for configuration.yaml (if applicable):

- platform: ffmpeg
  name: Fancy Camera
  input: -rtsp_transport tcp -i rtsp://10.99.0.110:8554/unicast

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass

[homeassistant]

Hi @jjlawren,

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Once you do that we will be able to review and accept this pull request.

Thanks!

[bachya]

Can merge when build passes. 👍

[edif30]

@jjlawren For some reason and I cannot figure out why, this PR caused errors on start for my cameras randomly.

I would just get this

[haffmpeg.tools] ReturnCode: 1 / STD: b'' / ERR: b'

Then a test would fail for one of the cameras. Also, I would randomly get a segfault and HA would restart itself during a restart. I think HA was getting to the ffmpeg await and failing/timeout and get lost. The seg fault was located at...

Oct 28 10:59:15 host kernel: [3068784.405869] traps: python[122862] general protection ip:7f2178493529 sp:7ffe0a20f500 error:0
Oct 28 10:59:15 host kernel: [3068784.405874]  in libc-2.24.so[7f217845f000+195000]

Soon as I reverted this change, I no longer see the issue. I run HA in a Docker container on 0.81.x.

We should revert this and test further or come up with another solution.