fix sd-xl enable xformers fa error

Signed-off-by: lijian <lijian6@sugon.com>

src/diffusers/pipelines/stable_diffusion_xl/pipeline_stable_diffusion_xl.py

@@ -1259,6 +1259,7 @@ class StableDiffusionXLPipeline(
                 if XLA_AVAILABLE:
                     xm.mark_step()
 
+        self.disable_xformers_memory_efficient_attention()
         if not output_type == "latent":
             # make sure the VAE is in float32 mode, as it overflows in float16
             needs_upcasting = self.vae.dtype == torch.float16 and self.vae.config.force_upcast