Remove redundant nil nftResult handling

This is already caught and handled before the switch logic and would
hence never be reached here.

Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>

nftables-http-api.go

@@ -133,8 +133,6 @@ func handleSetRoute(w http.ResponseWriter, r *http.Request) {
 			doReturn(w, http.StatusOK, "already exists")
 		case "added":
 			doReturn(w, http.StatusCreated, "ok")
-		case nil:
-			doReturn(w, http.StatusInternalServerError, "failure")
 		default:
 			doReturn(w, http.StatusInternalServerError, "unhandled result")
 		}