vulkan/runtime: fix allocation failure handling

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: 93d0c66b27 ("vulkan/pipeline_cache: Add helpers for storing NIR in the cache")
Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31982>

src/vulkan/runtime/vk_pipeline_cache.c

@@ -518,6 +518,10 @@ vk_pipeline_cache_add_nir(struct vk_pipeline_cache *cache,
                                       key_data, key_size,
                                       blob.data, blob.size);
    blob_finish(&blob);
+   if (data_obj == NULL) {
+      vk_pipeline_cache_log(cache, "Ran out of memory creating NIR shader");
+      return;
+   }
 
    struct vk_pipeline_cache_object *cached =
       vk_pipeline_cache_add_object(cache, &data_obj->base);