lib-http: test-http-client-errors: Make "peer reuse failure" test rel…

…iable.

It was highly timing-sensitive, since it required a particular error status to
be returned. Sometimes, it would yield a different error based on a
slightly different order of events, making the test fail. Such failures aren't
relevant though, since this regression test is about triggering a segfault that
used to occur.

src/lib-http/test-http-client-errors.c

@@ -2668,7 +2668,7 @@ test_client_peer_reuse_failure_response2(
 	if (debug)
 		i_debug("RESPONSE: %u %s", resp->status, resp->reason);
 
-	test_assert(resp->status == HTTP_CLIENT_REQUEST_ERROR_CONNECT_FAILED);
+	test_assert((resp->status / 100) > 2);
 	test_assert(resp->reason != NULL && *resp->reason != '\0');
 	i_free(ctx);
 	io_loop_stop(ioloop);