Fix CFI by removing extra cast

TBR=jshin@chromium.org
Bug:  1145094
Change-Id: I35483de9d2473df8177be32a036ba9583158afa6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/deps/icu/+/2517182
Reviewed-by: Frank Tang <ftang@chromium.org>
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/icu/+/449857
Reviewed-by: Fabrice de Gans-Riberi <fdegans@google.com>
3 files changed