intel: add comment explaining weird-looking code
Clang throws warnings here (-Wgnu-variable-sized-type-not-at-end)
because of a variable-sized array at the end of
drm_i915_query_topology_info
being aliased by the data
field in
topology
, but that's the point here, so let's explain it so that
the next me doesn't blindly listen to the compiler :)
Suggested-by: @brianp
/cc @tpalli @llandwerlin