fix: Detailed logging for RegisterErrorCb DCHECK

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (2d447ea) 77.41% compared to head (6d6d0aa) 77.40%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #155 +/- ## ========================================== - Coverage 77.41% 77.40% -0.02% ========================================== Files 98 98 Lines 7173 7173 ========================================== - Hits 5553 5552 -1 - Misses 1620 1621 +1 ``` | [Files](https://app.codecov.io/gh/romange/helio/pull/155?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Roman+Gershman) | Coverage Δ | | |---|---|---| | [util/fibers/uring\_socket.cc](https://app.codecov.io/gh/romange/helio/pull/155?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Roman+Gershman#diff-dXRpbC9maWJlcnMvdXJpbmdfc29ja2V0LmNj) | `74.35% <100.00%> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/romange/helio/pull/155/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Roman+Gershman)

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[dranikpg]

Signed