fix(lane_change): fix build error

[satoshi-ota]

Description

Since [[maybe_unused]] was removed in #3083, build error are shown when it sets following flag to FALSE.

autoware.universe/planning/behavior_path_planner/CMakeLists.txt

Line 10 in 2a23a4b

set(COMPILE_WITH_OLD_ARCHITECTURE TRUE)

--- stderr: behavior_path_planner                                                                                                                                                                            
/home/satoshi/pilot-auto/src/autoware/universe/planning/behavior_path_planner/src/util/lane_change/util.cpp: In function 'std::pair<bool, bool> behavior_path_planner::lane_change_utils::getLaneChangePaths(const PathWithLaneId&, const route_handler::RouteHandler&, const ConstLanelets&, const ConstLanelets&, const Pose&, const Twist&, autoware_auto_perception_msgs::msg::PredictedObjects_<std::allocator<void> >::Con
stSharedPtr, const BehaviorPathPlannerParameters&, const behavior_path_planner::LaneChangeParameters&, double, behavior_path_planner::LaneChangePaths*, std::unordered_map<std::__cxx11::basic_string<char>, marker_utils::CollisionCheckDebug>*)':
/home/satoshi/pilot-auto/src/autoware/universe/planning/behavior_path_planner/src/util/lane_change/util.cpp:318:14: error: variable 'arc_position_from_current' set but not used [-Werror=unused-but-set-variable]
  318 |   const auto arc_position_from_current = lanelet::utils::getArcCoordinates(original_lanelets, pose);  

Related PR: #3083

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[satoshi-ota]

@shmpwk Thanks 👍

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (2a23a4b) 11.92% compared to head (41901b8) 11.92%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3100   +/-   ##
=======================================
  Coverage   11.92%   11.92%           
=======================================
  Files        1334     1334           
  Lines       92928    92928           
  Branches    24729    24729           
=======================================
  Hits        11078    11078           
  Misses      70370    70370           
  Partials    11480    11480           

Flag	Coverage Δ		*Carryforward flag
differential	5.55% <0.00%> (?)
total	11.92% <ø> (+<0.01%)	⬆️	Carriedforward from 2a23a4b

*This pull request uses carry forward flags. Click here to find out more.

Impacted Files	Coverage Δ
...ehavior_path_planner/src/util/lane_change/util.cpp	0.00% <0.00%> (ø)

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