radv: memset radv_pipeline_cache_object data

This silences Valgrind warnings.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28549>

src/amd/vulkan/radv_pipeline_cache.c

@@ -265,6 +265,7 @@ radv_pipeline_cache_object_create(struct vk_device *device, unsigned num_shaders
    object->data_size = data_size;
    memcpy(object->sha1, hash, SHA1_DIGEST_LENGTH);
    memset(object->shaders, 0, sizeof(object->shaders[0]) * num_shaders);
+   memset(object->data, 0, data_size);
 
    return object;
 }