Check all return codes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (1a911cf) 80.31% compared to head (2a49a4d) 80.36%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #544 +/- ## ========================================== + Coverage 80.31% 80.36% +0.04% ========================================== Files 6 6 Lines 2901 2908 +7 ========================================== + Hits 2330 2337 +7 Misses 571 571 ```

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[odow]

This doesn't fix my segfault, but it is an improvement.