simplified if statements

Author: road-1

pandas/core/dtypes/dtypes.py

@@ -2282,9 +2282,7 @@ def numpy_dtype(self) -> np.dtype:
             # regardless of the pyarrow timestamp units.
             # This can be removed if/when pyarrow addresses it:
             # https://github.com/apache/arrow/issues/34462
-            if self.pyarrow_dtype.tz is not None:
-                np.dtype(self.pyarrow_dtype.to_pandas_dtype())
-            else:
+            if self.pyarrow_dtype.tz is None:
                 return np.dtype(f"datetime64[{self.pyarrow_dtype.unit}]")
         if pa.types.is_duration(self.pyarrow_dtype):
             # pa.duration(unit).to_pandas_dtype() returns ns units