drm/i915: Rewrite ABS_DIFF() in a safer manner
The new version of the macro does a few things better:
- protect the arguments,
- only evaluate the arguments once,
- check that the arguments are of the same type,
Change LC_FREQ_2K to be a unsigned 64bit constant and removed the '()'
from the caller as a result.
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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