chore: tidy things up

[utkuozdemir]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 70.72%. Comparing base (e7ececf) to head (0cca3b8).

Files	Patch %	Lines
cmd/nvidia_gpu_exporter/main.go	0.00%	2 Missing ⚠️
internal/exporter/csv.go	90.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #201   +/-   ##
=======================================
  Coverage   70.72%   70.72%           
=======================================
  Files           5        5           
  Lines         386      386           
=======================================
  Hits          273      273           
  Misses        104      104           
  Partials        9        9           

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