SMP call count reduce bug

[joezuntz]

Addresses #170

[codecov]

Codecov Report

Attention: Patch coverage is 55.55556% with 4 lines in your changes missing coverage. Please review.

Project coverage is 62.86%. Comparing base (814828d) to head (cd6ccbb).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
cosmosis/main.py	0.00%	2 Missing ⚠️
cosmosis/runtime/mpi_pool.py	50.00%	1 Missing ⚠️
cosmosis/runtime/process_pool.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #171      +/-   ##
==========================================
- Coverage   62.87%   62.86%   -0.02%     
==========================================
  Files         117      117              
  Lines       12801    12805       +4     
==========================================
+ Hits         8049     8050       +1     
- Misses       4752     4755       +3     

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