drm/radeon/kms: don't crash if no DDC bus on VGA/DVI connector.
This is strange - like really really strange, twilight zone of strange. VGA ports have DDC buses, but sometimes for some reasons the BIOS says we don't and we oops - AMD mentioned bios bugs so we'll have to add quirks. reported on irc by nirbheek and https://bugzilla.redhat.com/show_bug.cgi?id=554323Signed-off-by: Dave Airlie <firstname.lastname@example.org>
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