style: fix redundant return

[jmayclin]

Description of changes:

#1893

Solved using find and replace

Find

END_TEST\(\);\n.*return 0

Replace

END_TEST();

Testing:

All tests should pass

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[lrstewart]

Should we add a grep_simple_mistakes.sh for this? Otherwise we could add back some returns

[jmayclin]

I'm generally not inclined to add it in grep_simple_mistakes.sh since this removes all instances of it. My personal hypothesis is inconsistency is viral. Someone copy-pastes a file and edits it, and it goes from there. Since there are now 0 instances of the pattern, I'm less worried about it appearing again.