fix: invalid variable

Before: If user tries to run the code with float32 setting and flash_attention, they will encounter an undefined variable error, due to misspelling of `self.query`.
After: If user tries to run the code with float32 setting and flash_attention, they will correctly get a `float32 not supported `error

modeling_roberta.py

@@ -408,7 +408,7 @@ class RobertaFlashAttention2(RobertaSelfAttention):
             elif hasattr(self.config, "_pre_quantization_dtype"):
                 target_dtype = self.config._pre_quantization_dtype
             else:
-                target_dtype = self.q_lin.weight.dtype
+                target_dtype = self.query.weight.dtype
 
             logger.warning_once(
                 f"The input hidden states seems to be silently casted in float32, this might be related to"