Add missing return to switch/case statement
Summary: `case` clauses in `switch` statements are expected to end with a `return` or `break` statement.
Test Plan: Run static code analysis.
Reviewers: O1 Blessed Committers, avivey
Reviewed By: O1 Blessed Committers, avivey
Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D26478