br/streamhelper: fix panic while removing task (#50869)

[BornChanger]

close #50839

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What changed and how does it work?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

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None

[tiprow]

Hi @BornChanger. Thanks for your PR.

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[BornChanger]

/ok-to-test

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5-20240226-v6.5.7@cd073ea). Click here to learn what that means.
The diff coverage is 79.4117%.

Additional details and impacted files

@@                       Coverage Diff                        @@
##             release-6.5-20240226-v6.5.7     #51305   +/-   ##
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  Coverage                               ?   73.6772%           
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  Files                                  ?       1090           
  Lines                                  ?     349956           
  Branches                               ?          0           
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  Hits                                   ?     257838           
  Misses                                 ?      75571           
  Partials                               ?      16547           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tangenta, YuJuncen

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• OWNERS [YuJuncen,tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-26 06:16:20.554085583 +0000 UTC m=+856269.301708692: ☑️ agreed by YuJuncen.
• 2024-02-26 09:39:19.872138619 +0000 UTC m=+868448.619761730: ☑️ agreed by tangenta.