aco: fix fp16 *0.5 omod

We were testing for -0.5 instead.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Fixes: 1210e0bd620 ("aco: create 16-bit input and output modifiers")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7605>
(cherry picked from commit 0c522d3aa7432b72c2ed773218d6f0eb25f58943)
2 files changed