Fixed typo of the parameter passed to RPCError

Author: ksato9700

msgpackrpc/future.py

@@ -30,7 +30,7 @@ def get(self):
 
         if self._error_handler is not None:
             self._error_handler(self._error)
-        raise error.RPCError(error)
+        raise error.RPCError(self._error)
 
     def set(self, error=None, result=None):
         self._error = error