Remove useless errors.AddStack

[lucklove]

Fix #721

What problem does this PR solve?

Remove redundant errors.AddStack

What is changed and how it works?

errors.AddStack(err) -> err

Check List

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[codecov-io]

Codecov Report

Merging #985 (388d740) into master (e921248) will decrease coverage by 3.85%.
The diff coverage is 2.95%.

@@            Coverage Diff             @@
##           master     #985      +/-   ##
==========================================
- Coverage   55.49%   51.64%   -3.86%     
==========================================
  Files         279      279              
  Lines       19709    19709              
==========================================
- Hits        10937    10178     -759     
- Misses       7055     7896     +841     
+ Partials     1717     1635      -82     

Flag	Coverage Δ
cluster	38.11% <1.02%> (-5.25%)	⬇️
dm	23.81% <0.00%> (-0.02%)	⬇️
integrate	45.89% <1.18%> (-3.87%)	⬇️
playground	20.29% <0.00%> (ø)
tiup	16.45% <2.38%> (ø)
unittest	23.08% <2.96%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
components/cluster/command/check.go	6.27% <0.00%> (-73.27%)	⬇️
components/cluster/command/display.go	27.41% <0.00%> (ø)
components/cluster/command/import.go	17.64% <0.00%> (ø)
components/cluster/command/test.go	40.35% <0.00%> (-19.30%)	⬇️
components/dm/ansible/import.go	62.69% <0.00%> (ø)
components/dm/command/import.go	19.35% <0.00%> (ø)
components/dm/command/scale_in.go	60.60% <0.00%> (ø)
components/playground/command.go	79.59% <0.00%> (ø)
components/playground/grafana.go	77.11% <0.00%> (ø)
components/playground/main.go	72.30% <0.00%> (ø)
... and 77 more

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[AstroProfundis]

/merge

[ti-chi-bot]

Can merge label has been added.

Git tree hash: 388d740