src/util: Remove out-of-range comparison

src/util: Remove out-of-range comparison

Silence the warning about this always-true comparison.

src/util/softfloat.c:214:42: warning: comparison of constant 32768
with expression of type 'int16_t' (aka 'short') is always false
[-Wtautological-constant-out-of-range-compare]
        } else if ((e > 0x1d) || (0x8000 <= m)) {
                                  ~~~~~~ ^  ~

Reviewed-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5174>