dzn: Add Missing return type to dzn_translate_sampler_filter()

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15607>

src/microsoft/vulkan/dzn_util.c

@@ -169,6 +169,7 @@ static const struct dzn_sampler_filter_info filter_table[] = {
    [D3D12_FILTER_MIN_MAG_MIP_LINEAR] = FILTER(LINEAR, LINEAR, LINEAR),
 };
 
+D3D12_FILTER
 dzn_translate_sampler_filter(const VkSamplerCreateInfo *create_info)
 {
    D3D12_FILTER filter;