Fix some Revive lint warnings

[rajat2004]

Continuation of #49

Warnings fixed -

pkg/agent/csock/csock.go
  (60, 2)  https://revive.run/r#unhandled-error  Unhandled error in call to function json.Unmarshal  
  (68, 2)  https://revive.run/r#unhandled-error  Unhandled error in call to function rw.Write 

pkg/util/attime/attime_test.go
  (10, 37)  https://revive.run/r#empty-lines  extra empty line at the start of a bloc

pkg/storage/dict/trie.go   
  (116, 11)  https://revive.run/r#superfluous-else      if block ends with a continue statement, so drop this else and outdent its block  
  (73, 10)   https://revive.run/r#indent-error-flow     if block ends with a return statement, so drop this else and outdent its block

Unified diff is slightly difficult to read, easier to view the split one to ensure nothing has changed

[codecov]

Codecov Report

Merging #145 (9c0a809) into main (2eeedcb) will increase coverage by 2.26%.
The diff coverage is 48.58%.

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   55.27%   57.53%   +2.26%     
==========================================
  Files          69       69              
  Lines        2631     2632       +1     
==========================================
+ Hits         1454     1514      +60     
+ Misses       1073      998      -75     
- Partials      104      120      +16     

Impacted Files	Coverage Δ
pkg/agent/csock/csock.go	0.00% <0.00%> (ø)
pkg/storage/dict/trie.go	75.00% <58.63%> (-0.86%)	⬇️
pkg/storage/segment/segment.go	92.50% <0.00%> (-4.16%)	⬇️
pkg/analytics/analytics.go	83.34% <0.00%> (-3.03%)	⬇️
pkg/agent/session.go	73.26% <0.00%> (+4.66%)	⬆️
pkg/server/controller.go	25.75% <0.00%> (+25.75%)	⬆️
pkg/server/ingest.go	66.04% <0.00%> (+66.04%)	⬆️
pkg/server/stats.go	66.67% <0.00%> (+66.67%)	⬆️

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[petethepig]

Looks good, thank you @rajat2004 !