Add [[maybe_unused]]

QUICHE_LOG_IF is removed in some build.

PiperOrigin-RevId: 610504919

quiche/quic/tools/interactive_cli.cc

diff --git a/quiche/quic/tools/interactive_cli.cc b/quiche/quic/tools/interactive_cli.cc
index 692b180..93e373a 100644
--- a/quiche/quic/tools/interactive_cli.cc
+++ b/quiche/quic/tools/interactive_cli.cc
@@ -41,7 +41,7 @@
     QUICHE_LOG(FATAL) << "Both stdin and stdout must be a TTY";
   }
 
-  bool success =
+  [[maybe_unused]] bool success =
       event_loop_->RegisterSocket(STDIN_FILENO, kSocketEventReadable, this);
   QUICHE_LOG_IF(FATAL, !success)
       << "Failed to register stdin with the event loop";
@@ -66,7 +66,7 @@
     tcsetattr(STDIN_FILENO, TCSANOW,
               reinterpret_cast<termios*>(old_termios_.get()));
   }
-  bool success = event_loop_->UnregisterSocket(STDIN_FILENO);
+  [[maybe_unused]] bool success = event_loop_->UnregisterSocket(STDIN_FILENO);
   QUICHE_LOG_IF(ERROR, !success) << "Failed to unregister stdin";
 }