Do not process data in read buffer after disconnect

[codecov[bot]]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (2ecc983) 65.93% compared to head (8f9de78) 65.89%.

Files	Patch %	Lines
src/io.rs	65.51%	10 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #156 +/- ## ========================================== - Coverage 65.93% 65.89% -0.04% ========================================== Files 53 53 Lines 9346 9353 +7 ========================================== + Hits 6162 6163 +1 - Misses 3184 3190 +6 ```

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