Merge bitcoin/bitcoin#29968: refactor: Avoid unused-variable warning in init.cpp

fa9abf9 refactor: Avoid unused-variable warning in init.cpp (MarcoFalke)

Pull request description:

  Fixes bitcoin/bitcoin#27679 (comment)

ACKs for top commit:
  TheCharlatan:
    ACK fa9abf9

Tree-SHA512: dcf56d7aa68578ba611a2dc591de036ab1d08f7f4dfb35d325ecf7241d8e17abc0af7005b96c44da9777adc36961b4da7fdde282a1ab0e0a6f229c8108923101

Author: fanquake

src/init.cpp

@@ -1297,7 +1297,7 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         }
     }
 
-    for (const auto &port_option : std::vector<std::pair<std::string, bool>>{
+    for ([[maybe_unused]] const auto& [arg, unix] : std::vector<std::pair<std::string, bool>>{
         // arg name            UNIX socket support
         {"-i2psam",                 false},
         {"-onion",                  true},
@@ -1309,10 +1309,8 @@ bool AppInitMain(NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip_info)
         {"-zmqpubhashtx",           true},
         {"-zmqpubrawblock",         true},
         {"-zmqpubrawtx",            true},
-        {"-zmqpubsequence",         true}
+        {"-zmqpubsequence",         true},
     }) {
-        const std::string arg{port_option.first};
-        const bool unix{port_option.second};
         for (const std::string& socket_addr : args.GetArgs(arg)) {
             std::string host_out;
             uint16_t port_out{0};