[Tile-serving] [openstreetmap/mod_tile] Address compiler warnings (PR #376)

[Codecov Comments Bot]

## [Codecov](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) Report
Attention: `5 lines` in your changes are missing coverage. Please review.
> Comparison is base [(`a0a1092`)](https://app.codecov.io/gh/openstreetmap/mod_tile/commit/a0a10927218ffaa28fb78371a7c4fbc049dce05e?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 66.43% compared to head [(`c3316f3`)](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) 66.13%.

| [Files](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) | Patch % | Lines |
|---|---|---|
| [src/request\_queue.c](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap#diff-c3JjL3JlcXVlc3RfcXVldWUuYw==) | 0.00% | [4 Missing :warning: ](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) |
| [src/gen\_tile.cpp](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap#diff-c3JjL2dlbl90aWxlLmNwcA==) | 0.00% | [1 Missing :warning: ](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap) |

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<details><summary>Additional details and impacted files</summary>


```diff
@@            Coverage Diff             @@
##           master     #376      +/-   ##
==========================================
- Coverage   66.43%   66.13%   -0.30%     
==========================================
  Files          23       23              
  Lines        4615     4619       +4     
==========================================
- Hits         3066     3055      -11     
- Misses       1549     1564      +15     
```



</details>

[:umbrella: View full report in Codecov by Sentry](https://app.codecov.io/gh/openstreetmap/mod_tile/pull/376?src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openstreetmap).   
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