Fixed telemetry skipping logic

Author: wrisa

instrumentation-genai/opentelemetry-instrumentation-langchain/src/opentelemetry/instrumentation/langchain/callback_handler.py

@@ -55,10 +55,8 @@ def on_chat_model_start(
         **kwargs: Any,
     ) -> None:
         # Other providers/LLMs may be supported in the future and telemetry for them is skipped for now.
-        if serialized and "name" in serialized:
-            name = serialized.get("name")
-            if name not in ("ChatOpenAI", "ChatBedrock"):
-                return
+        if serialized.get("name") not in ("ChatOpenAI", "ChatBedrock"):
+              return
 
         if "invocation_params" in kwargs:
             params = (