Fix codewarnings

[jcbf]

Fixed some compile warnings

[codecov]

Codecov Report

Merging #54 into master will decrease coverage by 0.17%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
- Coverage   87.25%   87.07%   -0.18%     
==========================================
  Files           1        1              
  Lines         502      503       +1     
==========================================
  Hits          438      438              
- Misses         64       65       +1

Impacted Files	Coverage Δ
smf-spf.c	87.07% <0%> (-0.18%)	⬇️

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[coveralls]

Coverage decreased (-0.2%) to 87.23% when pulling ce2f34e on jcbf/fix_codewarnings into 0dc862a on master.