anv: Stop printing descriptor pool allocation failures

The VK_ERROR_FRAGMENTED_POOL and VK_ERROR_OUT_OF_POOL_MEMORY errors are
not as exceptional cases as most.  These are expected to be hit by
applications in the normal course of doing their thing.  Probably best
not to spam stderr and the debug logs with them.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13045>

src/intel/vulkan/anv_descriptor_set.c

@@ -980,9 +980,9 @@ anv_descriptor_pool_alloc_set(struct anv_descriptor_pool *pool,
       }
 
       if (pool->free_list != EMPTY) {
-         return vk_error(VK_ERROR_FRAGMENTED_POOL);
+         return VK_ERROR_FRAGMENTED_POOL;
       } else {
-         return vk_error(VK_ERROR_OUT_OF_POOL_MEMORY);
+         return VK_ERROR_OUT_OF_POOL_MEMORY;
       }
    }
 }