Add default to switch statement fpr show_access
Add default to switch statement fpr show_access

Summary: Make sure C++ compiler knows all cases are covered to supresses warnings.

Reviewed By: dariorussi

Differential Revision: D4118077

fbshipit-source-id: ff95b59c70c82ab460bdb7f008507dc5ac93b8b3

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex