all: fix some errcheck warnings

Created by: keegancsmith

A new meditation for yuppie software engineers. Run errcheck on our codebase and fix some of the warnings. 5 minutes a day will lead to a better, happier and examined life.

Most fixes are just explicitly marking we are ignoring the error. This is the case often since we are writing a response and there is no reasonable recourse if it fails. Some changes handle the error.