b80720acb1
The prototype uses a pointer and the actual function definition had an
array. For some reason, GCC never complained about this until GCC 11.
This fixes a compile warning when building with GCC 11.
Fixes: 09ced65420 "intel/isl: Add format conversion code"
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10537>