fix warnings

[carns]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 57.72%. Comparing base (8645635) to head (f3b0774).

Files with missing lines	Patch %	Lines
src/margo-core.c	0.00%	4 Missing ⚠️
tests/unit-tests/margo-init.c	95.45%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #291      +/-   ##
==========================================
+ Coverage   57.67%   57.72%   +0.05%     
==========================================
  Files          70       70              
  Lines       10149    10148       -1     
  Branches     1335     1335              
==========================================
+ Hits         5853     5858       +5     
+ Misses       3462     3456       -6     
  Partials      834      834              

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