[Bugfix] Correct max tokens for non-contiguous embeds

vllm/multimodal/profiling.py

@@ -184,7 +184,7 @@ def _get_mm_num_tokens(
         placeholders_by_modality = mm_inputs["mm_placeholders"]
 
         return {
-            modality: sum(item.get_num_embeds() for item in placeholders)
+            modality: sum(item.length for item in placeholders)
             for modality, placeholders in placeholders_by_modality.items()
         }