Fix receiver delivery queue handling

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 57.07%. Comparing base (7f968a5) to head (00bb769).

Files	Patch %	Lines
src/rcvlink.rs	37.50%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #48 +/- ## ========================================== - Coverage 57.12% 57.07% -0.06% ========================================== Files 35 35 Lines 3608 3613 +5 ========================================== + Hits 2061 2062 +1 - Misses 1547 1551 +4 ```

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