freedreno: Fix warning about uninit size for the size==0 special case.

The size==0 query case would have just used uninitialized stack data for
sizing its BOs.

Fixes: 536ec9d7f5ab ("freedreno: Refactor fd_resource_create_with_modifiers() into a helper")
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7664>
(cherry picked from commit 239bae7b942dc900b3768e42b96580dc4f85068a)
2 files changed