Fix 'errcheck' linter warnings

[vkd]

No description provided.

[codecov]

Codecov Report

Merging #2093 into master will decrease coverage by 0.08%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #2093      +/-   ##
==========================================
- Coverage   98.92%   98.83%   -0.09%     
==========================================
  Files          40       40              
  Lines        2229     2231       +2     
==========================================
  Hits         2205     2205              
- Misses         12       13       +1     
- Partials       12       13       +1

Impacted Files	Coverage Δ
gin.go	98.28% <33.33%> (-0.86%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8a1bfcf...5b32b4a. Read the comment docs.

[Dominik-K]

@vkd Which (meta-)linter are you using? It seems that it didn't find that the error for os.Remove() isn't checked (in RunUnix()), as well.

[vkd]

@Dominik-K I use the golangci-lint