ams: support building unit test programs on windows/linux/macos

libraries/libstratosphere/source/htc/server/rpc/htc_rpc_client.cpp

@@ -287,7 +287,7 @@ namespace ams::htc::server::rpc {
         while (true) {
             /* Get a task. */
             Task *task;
-            u32 task_id;
+            u32 task_id{};
             PacketCategory category;
             do {
                 /* Dequeue a task. */