Fix scan-build warnings

[adsr]

Running clang's static analyzer scan-build:

$ scan-build make clean_quick all mle_vendor=1

emits the following warnings:

I looked at a few and they appear to be simple fixes -- good for Hacktoberfest.

[proh14]

Hello :), I'm working on it!

#85

[adsr]

Brilliant, thank you @proh14