refactor: simplify report functions in main.go

[weidongkl]

• Remove redundant error handling patterns in printReport and saveReport
• Directly return report.CreateReport results instead of if-else blocks
• Maintain functionality while improving code readability

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 64.48%. Comparing base (1216c9b) to head (e56a5df).
⚠️ Report is 138 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/gosec/main.go	0.00%	2 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1434      +/-   ##
==========================================
- Coverage   68.49%   64.48%   -4.02%     
==========================================
  Files          75       76       +1     
  Lines        4384     4618     +234     
==========================================
- Hits         3003     2978      -25     
- Misses       1233     1498     +265     
+ Partials      148      142       -6     

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