fix: devop IAM bugs

Signed-off-by: hongming <talonwan@yunify.com>

pkg/kapis/oauth/handler.go

@@ -290,6 +290,7 @@ func (h *handler) passwordGrant(username string, password string, req *restful.R
 			return
 		default:
 			response.WriteError(http.StatusInternalServerError, apierrors.NewInternalError(err))
+			return
 		}
 	}