Remove "return;" from last line of void functions

[thnkslprpt]

Checklist

• [x] I reviewed the Contributing Guide.
• [x] I performed a cursory search to see if the bug report is relevant, not redundant, nor in conflict with other tickets.

Describe the bug "return;" at last line in void function is redundant. Copy of https://github.com/nasa/cFE/issues/1540

Describe the solution you'd like Remove

Reporter Info @thnkslprpt