MDEV-33935 fix deadlock counter

[yvef]

trafficstars

• [x] The Jira issue number for this PR is: MDEV-33935

Description

Fixed deadlock counter incrementing on every call to cycle finding that was used multiple times during the deadlock detection.

Release Notes

How can this PR be tested?

./mtr mdev-33935

Basing the PR against the correct MariaDB version

• [ ] This is a new feature and the PR is based against the latest MariaDB development branch.
• [x] This is a bug fix and the PR is based against the earliest maintained branch in which the bug can be reproduced.

PR quality check

• [x] I checked the CODING_STANDARDS.md file and my PR conforms to this where appropriate.
• [x] For any trivial modifications to the PR, I am ok with the reviewer making the changes themselves.