Delete the duplicate code for the contolnet img 2 img (#4411)

delete the duplicated code from the controlnet-img-2-img pipelines

src/diffusers/pipelines/controlnet/pipeline_controlnet_img2img.py

@@ -921,8 +921,6 @@ class StableDiffusionControlNetImg2ImgPipeline(
         # corresponds to doing no classifier free guidance.
         do_classifier_free_guidance = guidance_scale > 1.0
 
-        controlnet = self.controlnet._orig_mod if is_compiled_module(self.controlnet) else self.controlnet
-
         if isinstance(controlnet, MultiControlNetModel) and isinstance(controlnet_conditioning_scale, float):
             controlnet_conditioning_scale = [controlnet_conditioning_scale] * len(controlnet.nets)