mesa/get: fix enum16 big-endian getting.

These values were getting casted up to 32-bit, but then extracted
via 16-bit pointer later. Just store via 16-bit.

Fixes a lot of piglit on s390

Fixes: f96a69f916ae ("mesa: replace GLenum with GLenum16 in common structures (v4)");

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5679>
1 file changed