rc: pass response writer when needsResponse is set instead of pointer

rc: Fix failing tests for *http.ResponseWriter

fs/rc/params.go

@@ -120,7 +120,7 @@ func (p Params) GetHTTPResponseWriter() (*http.ResponseWriter, error) {
 	}
 	request, ok := value.(*http.ResponseWriter)
 	if !ok {
-		return nil, ErrParamInvalid{errors.Errorf("expecting http.ResponseWriter value for key %q (was %T)", key, value)}
+		return nil, ErrParamInvalid{errors.Errorf("expecting *http.ResponseWriter value for key %q (was %T)", key, value)}
 	}
 	return request, nil
 }

fs/rc/rcserver/rcserver.go

@@ -266,7 +266,7 @@ func (s *Server) handlePost(w http.ResponseWriter, r *http.Request, path string)
 	}
 
 	if call.NeedsResponse {
-		in["_response"] = &w
+		in["_response"] = w
 	}
 
 	// Check to see if it is async or not