drm: sun4i: hdmi: Fix oops when disabling output #4
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If the display does not indicate audio support in the EDID, hdmi->hdmi_audio will be NULL. In this case, we avoid setting up audio output, however we were still attempting to tear it down on disable.
This could lead to a null pointer exception when disabling the output.
Fix the issue by using the same check on tear down as we do on create.