Fix missing raise statements in check_inputs (#7473)

Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

examples/community/llm_grounded_diffusion.py

@@ -530,7 +530,7 @@ class LLMGroundedDiffusionPipeline(
                 )
 
         if len(phrases) != len(boxes):
-            ValueError(
+            raise ValueError(
                 "length of `phrases` and `boxes` has to be same, but"
                 f" got: `phrases` {len(phrases)} != `boxes` {len(boxes)}"
             )

src/diffusers/pipelines/stable_diffusion_gligen/pipeline_stable_diffusion_gligen.py

@@ -469,7 +469,7 @@ class StableDiffusionGLIGENPipeline(DiffusionPipeline, StableDiffusionMixin):
                 )
 
         if len(gligen_phrases) != len(gligen_boxes):
-            ValueError(
+            raise ValueError(
                 "length of `gligen_phrases` and `gligen_boxes` has to be same, but"
                 f" got: `gligen_phrases` {len(gligen_phrases)} != `gligen_boxes` {len(gligen_boxes)}"
             )