Move activeConnections to Server

src/connection_registry.cpp

@@ -36,7 +36,9 @@ ConnectionRegistry::~ConnectionRegistry() {
     for (size_t fd = 0; fd < max_fds_; ++fd) {
       delete connections_[fd];
     }
-    munmap(connections_, aligned_size_);
+    if (munmap(connections_, aligned_size_) == -1) {
+      perror("munmap");
+    }
   }
 }