drm/bochs: add edid present check
Check header before trying to read the complete edid blob, to avoid the log being spammed in case qemu has no edid support (old qemu or edid support turned off). Fixes: 01f23459 drm/bochs: add edid support. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com> Link: http://patchwork.freedesktop.org/patch/msgid/20181220101122.16153-1-kraxel@redhat.com
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