Fix warning msg on quantization (#1715)

Author: WoosukKwon

vllm/config.py

@@ -137,9 +137,9 @@ def _verify_quantization(self) -> None:
                 raise ValueError(
                     f"Unknown quantization method: {self.quantization}. Must "
                     f"be one of {supported_quantization}.")
-        logger.warning(f"{self.quantization} quantization is not fully "
-                       "optimized yet. The speed can be slower than "
-                       "non-quantized models.")
+            logger.warning(f"{self.quantization} quantization is not fully "
+                           "optimized yet. The speed can be slower than "
+                           "non-quantized models.")
 
     def verify_with_parallel_config(
         self,