Fix newly appeared clang-tidy readability-function-cognitive-complexity errors

[aobolensk]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 63.15789% with 7 lines in your changes missing coverage. Please review.

Project coverage is 94.94%. Comparing base (3fb6776) to head (8616a14).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
tasks/mpi/example/src/ops_mpi.cpp	63.15%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #366      +/-   ##
==========================================
- Coverage   96.50%   94.94%   -1.56%     
==========================================
  Files          26       26              
  Lines         487      495       +8     
  Branches      143      145       +2     
==========================================
  Hits          470      470              
- Misses          5       12       +7     
- Partials       12       13       +1     

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