Fix warnings

[fspindle]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 45.42%. Comparing base (3e0e2d3) to head (b6350f6).
Report is 1 commits behind head on master.

Files	Patch %	Lines
example/particle-filter/pf-nonlinear-example.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1447      +/-   ##
==========================================
- Coverage   45.42%   45.42%   -0.01%     
==========================================
  Files        1110     1110              
  Lines      110525   110525              
  Branches    18922    18923       +1     
==========================================
- Hits        50205    50203       -2     
- Misses      60320    60322       +2     

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