br: Remove statement from closure to prevent concurrent operation during backup system table

[ti-chi-bot]

This is an automated cherry-pick of #1449

What problem does this PR solve?

Issue Number: close pingcap/tidb#29710

Cherry-pick from pingcap/tidb#29730

What is changed and how it works?

Release note

• No release note

[ti-chi-bot]

[REVIEW NOTIFICATION]

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• 3pointer
• kennytm

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[kennytm]

@glorv

[2021-12-08T02:21:35.969Z] pkg/backup/schema_test.go:20:2: imported and not used: "github.com/pingcap/br/pkg/storage"

[2021-12-08T02:21:35.969Z] pkg/backup/schema_test.go:194:10: s.GetRandomStorage undefined (type *testBackupSchemaSuite has no field or method GetRandomStorage)

[2021-12-08T02:21:35.969Z] pkg/backup/schema_test.go:213:17: undefined: metautil

[2021-12-08T02:21:35.969Z] pkg/backup/schema_test.go:214:6: assignment mismatch: 1 variable but backupSchemas.BackupSchemas returns 2 values

[2021-12-08T02:21:35.969Z] pkg/backup/schema_test.go:214:35: too many arguments in call to backupSchemas.BackupSchemas

[2021-12-08T02:21:35.969Z] pkg/backup/schema_test.go:218:15: s.GetSchemasFromMeta undefined (type *testBackupSchemaSuite has no field or method GetSchemasFromMeta)

[glorv]

@joccau PTAL

[3pointer]

LGTM

[kennytm]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 41c75d2

[ti-chi-bot]

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[ti-chi-bot]

Merge canceled because a new commit is pushed.

[joccau]

/merge

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[joccau]

No need merge, because this concurrent operation bug doesn't exist in version v5.0