Fix crash in FPC codec

[alexey-milovidov]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

The server crashed when decompressing malformed data using the FPC codec. This issue was found with ClickHouse Bug Bounty Program by https://twitter.com/malacupa

[robot-clickhouse-ci-2]

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Check name	Description	Status
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Check name	Description	Status
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[antonio2368]

This causes 00002_log_and_exception_messages_formatting to fail because of exceptions shorter than 30 check