fix: reduce manual resource management

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (1f9ac49) 59.19% compared to head (81e49c9) 59.55%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1046 +/- ## ========================================== + Coverage 59.19% 59.55% +0.36% ========================================== Files 19 19 Lines 2551 2564 +13 Branches 912 912 ========================================== + Hits 1510 1527 +17 + Misses 695 692 -3 + Partials 346 345 -1 ``` | [Files](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google) | Coverage Δ | | |---|---|---| | [src/glog/logging.h](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL2dsb2cvbG9nZ2luZy5o) | `73.23% <ø> (ø)` | | | [src/raw\_logging.cc](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL3Jhd19sb2dnaW5nLmNj) | `93.44% <100.00%> (ø)` | | | [src/utilities.cc](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL3V0aWxpdGllcy5jYw==) | `70.58% <100.00%> (ø)` | | | [src/utilities.h](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL3V0aWxpdGllcy5o) | `100.00% <100.00%> (ø)` | | | [src/vlog\_is\_on.cc](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL3Zsb2dfaXNfb24uY2M=) | `61.71% <100.00%> (ø)` | | | [src/symbolize.cc](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL3N5bWJvbGl6ZS5jYw==) | `52.79% <0.00%> (-0.87%)` | :arrow_down: | | [src/windows/dirent.h](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL3dpbmRvd3MvZGlyZW50Lmg=) | `32.50% <50.00%> (+0.68%)` | :arrow_up: | | [src/logging.cc](https://app.codecov.io/gh/google/glog/pull/1046?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=google#diff-c3JjL2xvZ2dpbmcuY2M=) | `67.29% <63.63%> (+0.02%)` | :arrow_up: |