Fix bugprone-unused-return-value clang-tidy warning (#6934)

Author: SiarheiFedartsou

.clang-tidy

@@ -17,7 +17,6 @@ Checks: >
     -bugprone-incorrect-enable-if,
     -bugprone-switch-missing-default-case,
     -bugprone-empty-catch,
-    -bugprone-unused-return-value,
     -clang-analyzer-*,
     -clang-diagnostic-deprecated-declarations,
     -clang-diagnostic-constant-conversion,

CHANGELOG.md

@@ -24,6 +24,7 @@
     - NodeJS:
       - CHANGED: Use node-api instead of NAN. [#6452](https://github.com/Project-OSRM/osrm-backend/pull/6452)
     - Misc:
+      - FIXED: Fix bugprone-unused-return-value clang-tidy warning. [#6934](https://github.com/Project-OSRM/osrm-backend/pull/6934)
       - FIXED: Fix performance-noexcept-move-constructor clang-tidy warning. [#6931](https://github.com/Project-OSRM/osrm-backend/pull/6933)
       - FIXED: Fix performance-noexcept-swap clang-tidy warning. [#6931](https://github.com/Project-OSRM/osrm-backend/pull/6931)
       - CHANGED: Use custom struct instead of std::pair in QueryHeap. [#6921](https://github.com/Project-OSRM/osrm-backend/pull/6921)

src/server/connection.cpp

@@ -186,6 +186,7 @@ void Connection::handle_timeout(boost::system::error_code ec)
     if (ec != boost::asio::error::operation_aborted)
     {
         boost::system::error_code ignore_error;
+        // NOLINTNEXTLINE(bugprone-unused-return-value)
         TCP_socket.cancel(ignore_error);
         handle_shutdown();
     }
@@ -197,6 +198,7 @@ void Connection::handle_shutdown()
     timer.cancel();
     // Initiate graceful connection closure.
     boost::system::error_code ignore_error;
+    // NOLINTNEXTLINE(bugprone-unused-return-value)
     TCP_socket.shutdown(boost::asio::ip::tcp::socket::shutdown_both, ignore_error);
 }