Misc. small bug fixes and code cleanups

[notr1ch]

Description

Minor miscellaneous fixes and cleanups.

Motivation and Context

Ran OBS with UBSan and ASan and found a few minor issues that weren't really worth splitting into individual PRs.

How Has This Been Tested?

Run with debug breakpoints to verify.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• Code cleanup (non-breaking change which makes code smaller or more readable)

Checklist:

• [x] My code has been run through clang-format.
• [x] I have read the contributing document.
• [x] My code is not on the master branch.
• [x] The code has been tested.
• [x] All commit messages are properly formatted and commits squashed where appropriate.
• [x] I have included updates to all appropriate documentation.