fix IneffAssign issues

[dikhan]

Proposed changes

Please add as many details as possible about the change here. Does this Pull Request resolve any open issue? If so, please make sure to link to that issue:

Fixes IneffAssign issues

Type of change

What type of change does your code introduce to the provider? Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [ ] Bug-fix (change that fixes current functionality)
• [ ] New feature (change that adds new functionality)
• [x] Enhancement (change that adds new functionality)

Checklist

Please put an x (w/o heading/trailing white spaces) in the boxes that apply:

• [x] I have read and followed the CONTRIBUTING guidelines
• [x] I have made sure code compiles correctly
• [x] I have run 'make test' locally from the terraform_provider_api folder and no errors were found
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have added/updated necessary documentation (if appropriate)

[codecov[bot]]

Codecov Report

Merging #170 into master will increase coverage by <.01%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #170      +/-   ##
=========================================
+ Coverage   88.89%   88.9%   +<.01%     
=========================================
  Files          51      51              
  Lines        3044    3046       +2     
=========================================
+ Hits         2706    2708       +2     
  Misses        218     218              
  Partials      120     120

Impacted Files	Coverage Δ
openapi/data_source_factory.go	98.09% <100%> (+0.03%)	:arrow_up:
openapi/openapi_spec_resource_schema_definition.go	95.87% <100%> (ø)	:arrow_up:

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