Fix warnings

[fspindle]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 42.42424% with 19 lines in your changes missing coverage. Please review.

Project coverage is 45.42%. Comparing base (70e8e7e) to head (3e0e2d3).
Report is 14 commits behind head on master.

Files	Patch %	Lines
...es/core/test/image-with-dataset/testConversion.cpp	33.33%	6 Missing ⚠️
tutorial/kalman/tutorial-ukf.cpp	0.00%	4 Missing ⚠️
example/device/framegrabber/readRealSenseData.cpp	0.00%	2 Missing ⚠️
...s/src/visual-feature/vpFeatureLuminanceMapping.cpp	50.00%	2 Missing ⚠️
tutorial/misc/npz/tutorial-npz.cpp	0.00%	2 Missing ⚠️
example/particle-filter/pf-nonlinear-example.cpp	75.00%	1 Missing ⚠️
modules/core/include/visp3/core/vpParticleFilter.h	66.66%	1 Missing ⚠️
...les/imgproc/src/vpCircleHoughTransform_circles.cpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1446   +/-   ##
=======================================
  Coverage   45.42%   45.42%           
=======================================
  Files        1110     1110           
  Lines      110523   110525    +2     
  Branches    18922    18922           
=======================================
+ Hits        50203    50205    +2     
  Misses      60320    60320           

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