Fix the crashing joint limiters when used with multiple interfaces

[saikishor]

Fixes: #2248
Unblocks: ros-controls/ros2_control_demos#805

[christophfroehlich]

Thanks for fixing this, I confirm that this fixes #2248

[codecov]

Codecov Report

Attention: Patch coverage is 95.83333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 88.90%. Comparing base (9371d59) to head (fa979c1).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
joint_limits/src/joint_range_limiter.cpp	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2371      +/-   ##
==========================================
+ Coverage   88.88%   88.90%   +0.02%     
==========================================
  Files         148      148              
  Lines       16946    16950       +4     
  Branches     1443     1448       +5     
==========================================
+ Hits        15062    15070       +8     
+ Misses       1320     1318       -2     
+ Partials      564      562       -2     

Flag	Coverage Δ
unittests	88.90% <95.83%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
hardware_interface/src/resource_manager.cpp	77.89% <100.00%> (ø)
...nt_limits/include/joint_limits/data_structures.hpp	80.55% <100.00%> (+4.69%)	⬆️
joint_limits/src/joint_limits_helpers.cpp	89.69% <100.00%> (+1.45%)	⬆️
joint_limits/src/joint_soft_limiter.cpp	89.68% <100.00%> (+0.71%)	⬆️
joint_limits/test/test_joint_soft_limiter.cpp	99.64% <100.00%> (+<0.01%)	⬆️
joint_limits/src/joint_range_limiter.cpp	90.90% <80.00%> (ø)

... and 1 file with indirect coverage changes

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