Refactor UselessCallOnNotNull rule

[schalkms]

No description provided.

[codecov]

Codecov Report

Merging #3208 (b1bdbe2) into master (7f8ee20) will increase coverage by 0.03%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master    #3208      +/-   ##
============================================
+ Coverage     80.07%   80.10%   +0.03%     
- Complexity     2638     2641       +3     
============================================
  Files           440      440              
  Lines          8019     8022       +3     
  Branches       1540     1538       -2     
============================================
+ Hits           6421     6426       +5     
  Misses          775      775              
+ Partials        823      821       -2     

Impacted Files	Coverage Δ	Complexity Δ
...urbosch/detekt/rules/style/UselessCallOnNotNull.kt	83.78% <81.81%> (+7.31%)	17.00 <4.00> (+3.00)

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