Correctly release txpool save and restore lock in case of exceptions #7473
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PR description
The disk access lock used when saving or restoring the txpool from disk, was not released in case of an exception, with the effect of stalling the sync
Fixed Issue(s)
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doc-change-required
label to this PR if updates are required.Locally, you can run these tests to catch failures early:
./gradlew build
./gradlew acceptanceTest
./gradlew integrationTest
./gradlew ethereum:referenceTests:referenceTests