Remove checkNotNull

[BraisGabin]

Avoid the use of checkNotNull when it's not necessary.

[codecov]

Codecov Report

Merging #3352 (1e6a39d) into master (da372a7) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #3352      +/-   ##
============================================
+ Coverage     80.27%   80.31%   +0.03%     
  Complexity     2713     2713              
============================================
  Files           445      445              
  Lines          8194     8195       +1     
  Branches       1558     1558              
============================================
+ Hits           6578     6582       +4     
  Misses          778      778              
+ Partials        838      835       -3     

Impacted Files	Coverage Δ	Complexity Δ
...tlin/io/gitlab/arturbosch/detekt/cli/JCommander.kt	100.00% <100.00%> (+8.69%)	0.00 <0.00> (ø)
...osch/detekt/core/baseline/BaselineResultMapping.kt	78.57% <100.00%> (+7.14%)	6.00 <4.00> (ø)

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[schalkms]

👍