BUG: Fix handling of encoding for the StataReader pandas-dev#21244

Author: Adrian Castravete

pandas/io/stata.py

@@ -1335,7 +1335,7 @@ def _calcsize(self, fmt):
 
     def _decode(self, s):
         s = s.partition(b"\0")[0]
-        return s.decode('utf-8')
+        return s.decode(self._encoding or self._default_encoding)
 
     def _null_terminate(self, s):
         if compat.PY3 or self._encoding is not None: