health_check_using_rpc: fix UT

src/brpc/channel.cpp

@@ -556,7 +556,7 @@ int Channel::Weight() {
 int Channel::CheckHealth() {
     if (_lb == NULL) {
         SocketUniquePtr ptr;
-        if (Socket::Address(_server_id, &ptr) == 0 && !ptr->IsAvailable()) {
+        if (Socket::Address(_server_id, &ptr) == 0 && ptr->IsAvailable()) {
             return 0;
         }
         return -1;

src/brpc/policy/weighted_round_robin_load_balancer.cpp

@@ -180,7 +180,7 @@ int WeightedRoundRobinLoadBalancer::SelectServer(const SelectIn& in, SelectOut*
         SocketId server_id = GetServerInNextStride(s->server_list, filter, tls_temp);
         if (!ExcludedServers::IsExcluded(in.excluded, server_id)
             && Socket::Address(server_id, out->ptr) == 0
-            && !(*out->ptr)->IsAvailable()) {
+            && (*out->ptr)->IsAvailable()) {
             // update tls.
             tls.remain_server = tls_temp.remain_server;
             tls.position = tls_temp.position;