drm/radeon/kms: fix some logic errors in combios i2c mapping

The virtual i2c to real i2c channel mappings weren't setting
the right id in some cases.

Spotted by: Andrew Randrianasulu

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 file changed