Clean up minor warnings from LGTM.com #7500
Merged
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LGTM (Semmie) is a tool, bought by GitHub last year, that conducts basic
linting tasks on code and HTML.
Clean up the warnings identified in the latest report:
https://lgtm.com/projects/g/esp8266/Arduino/?mode=list
No functionality should change, however this may fix some issues with
the python utilities not exiting properly on a Ctrl-C from the command
line.