Correct return values when missing resolver

[steve-tucker]

No description provided.

[codecov]

Codecov Report

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

Project coverage is 59.82%. Comparing base (566dd35) to head (13dc396).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
resolver.c	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   59.28%   59.82%   +0.53%     
==========================================
  Files          54       54              
  Lines        4883     4946      +63     
  Branches     1116     1154      +38     
==========================================
+ Hits         2895     2959      +64     
+ Misses       1359     1354       -5     
- Partials      629      633       +4     

Flag	Coverage Δ
macos	55.87% <0.00%> (+0.11%)	⬆️
ubuntu	56.27% <0.00%> (+0.97%)	⬆️
ubuntu_curl	58.39% <0.00%> (+1.01%)	⬆️
windows	56.72% <ø> (-0.12%)	⬇️

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