chore: simplify comparison and variable declaration

[hezhizhen]

Ⅰ. Describe what this PR does

Simplify some code, mainly comparison and variable declaration.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

lint and test

Ⅳ. Special notes for reviews

[codecov-commenter]

Codecov Report

Merging #1209 (7451e41) into master (6115b9c) will decrease coverage by 0.03%.
The diff coverage is 53.84%.

❗ Current head 7451e41 differs from pull request most recent head 764a347. Consider uploading reports for the commit 764a347 to get more accurate results

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@@            Coverage Diff             @@
##           master    #1209      +/-   ##
==========================================
- Coverage   50.04%   50.02%   -0.03%     
==========================================
  Files         143      143              
  Lines       19906    19892      -14     
==========================================
- Hits         9962     9950      -12     
+ Misses       8849     8847       -2     
  Partials     1095     1095              

Flag	Coverage Δ
unittests	50.02% <53.84%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
pkg/controller/broadcastjob/broadcastjob_utils.go	50.98% <0.00%> (ø)
...availablebudget/podunavailablebudget_controller.go	46.60% <0.00%> (+1.12%)	⬆️
...controller/broadcastjob/broadcastjob_controller.go	54.81% <28.57%> (-0.06%)	⬇️
.../controller/cloneset/cloneset_predownload_image.go	62.16% <66.66%> (ø)
pkg/control/sidecarcontrol/sidecarset_control.go	39.87% <100.00%> (-0.37%)	⬇️
...sistentpodstate/persistent_pod_state_controller.go	31.18% <100.00%> (ø)
pkg/controller/sidecarset/sidecarset_hotupgrade.go	67.05% <100.00%> (ø)
...roller/workloadspread/workloadspread_controller.go	63.52% <100.00%> (ø)
...ting/resourcedistribution_create_update_handler.go	63.09% <100.00%> (ø)
pkg/controller/cloneset/cloneset_controller.go	53.48% <0.00%> (-1.87%)	⬇️
... and 2 more

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[zmberg]

Why you need to change here?

[hezhizhen]

I wanted to write something like

if !isPast && leftTime>0 { return xxx }

klog.Infof(xxx)
...
return xxx

But I was not sure of its correctness, so I reverted it, but this modification was kept.

[zmberg]

/lgtm

[zmberg]

/approve

[kruise-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zmberg

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