nvk: use nvk_pipeline_zalloc

3b3b157961 removed setting the pipeline type
assuming that it was already set by nvk_pipeline_zalloc. That helper was
not actually being used, so this patch updates it to do so.

This does not fix anything as the NVK_PIPELINE_GRAPHICS = 0 anyway, so it
is just a code cleanup.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26329>

src/nouveau/vulkan/nvk_graphics_pipeline.c

@@ -309,8 +309,8 @@ nvk_graphics_pipeline_create(struct nvk_device *dev,
    struct nvk_graphics_pipeline *pipeline;
    VkResult result = VK_SUCCESS;
 
-   pipeline = vk_object_zalloc(&dev->vk, pAllocator, sizeof(*pipeline),
-                               VK_OBJECT_TYPE_PIPELINE);
+   pipeline = (void *)nvk_pipeline_zalloc(dev, NVK_PIPELINE_GRAPHICS,
+                                          sizeof(*pipeline), pAllocator);
    if (pipeline == NULL)
       return vk_error(dev, VK_ERROR_OUT_OF_HOST_MEMORY);