anv: Clean up anv_descriptor_pool::base on the error path

Fixes: 682c81bdfb "vulkan,anv: Add a base object struct type"
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10123>

src/intel/vulkan/anv_descriptor_set.c

@@ -880,6 +880,7 @@ VkResult anv_CreateDescriptorPool(
                                             0 /* explicit_address */,
                                             &pool->bo);
       if (result != VK_SUCCESS) {
+         vk_object_base_finish(&pool->base);
          vk_free2(&device->vk.alloc, pAllocator, pool);
          return result;
       }