misc(*) minor fixes to address a few warnings

[codecov[bot]]

Codecov Report

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

Project coverage is 90.62815%. Comparing base (5743252) to head (b7e02e3).

Additional details and impacted files

[](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong) ```diff @@ Coverage Diff @@ ## main #584 +/- ## =================================================== + Coverage 90.59985% 90.62815% +0.02830% =================================================== Files 49 49 Lines 10936 10905 -31 =================================================== - Hits 9908 9883 -25 + Misses 1028 1022 -6 ``` | [Files](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong) | Coverage Δ | | |---|---|---| | [src/wasm/ngx\_wasm\_core\_host.c](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584?src=pr&el=tree&filepath=src%2Fwasm%2Fngx_wasm_core_host.c&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong#diff-c3JjL3dhc20vbmd4X3dhc21fY29yZV9ob3N0LmM=) | `95.16129% <100.00000%> (ø)` | | ... and [3 files with indirect coverage changes](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong) | [Flag](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong) | `90.32763% <100.00000%> (+0.00100%)` | :arrow_up: | | [valgrind](https://app.codecov.io/gh/Kong/ngx_wasm_module/pull/584/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong) | `82.34626% <100.00000%> (+0.30606%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Kong#carryforward-flags-in-the-pull-request-comment) to find out more.