[hack] Fix bool conversion
[hack] Fix bool conversion

Summary: Oh, embarassingly to get bool you need to us Bool_val and not Val_bool

Reviewed By: dlreeves

Differential Revision: D5104230

fbshipit-source-id: 736fe8ad2c6df735352599b5f8773550fca794b4

gabelevi/flow,mroch/flow,ylu1317/flow,gabelevi/flow,AgentME/flow,nmote/flow,claudiopro/flow,AgentME/flow,popham/flow,AgentME/flow,claudiopro/flow,popham/flow,popham/flow,TiddoLangerak/flow,fletcherw/flow,claudiopro/flow,facebook/flow,ylu1317/flow,gabelevi/flow,popham/flow,gabelevi/flow,facebook/flow,jamesgpearce/flow,AgentME/flow,facebook/flow,MichaelDeBoey/flow,popham/flow,fletcherw/flow,JonathanUsername/flow,MichaelDeBoey/flow,jamesgpearce/flow,fletcherw/flow,nmote/flow,nmote/flow,TiddoLangerak/flow,nmote/flow,fletcherw/flow,samwgoldman/flow,AgentME/flow,gabelevi/flow,JonathanUsername/flow,facebook/flow,mroch/flow,ylu1317/flow,TiddoLangerak/flow,mroch/flow,claudiopro/flow,gabelevi/flow,facebook/flow,nmote/flow,jamesgpearce/flow,ylu1317/flow,samwgoldman/flow,JonathanUsername/flow,popham/flow,samwgoldman/flow,MichaelDeBoey/flow,samwgoldman/flow,fletcherw/flow,mroch/flow,JonathanUsername/flow,fletcherw/flow,mroch/flow,mroch/flow,jamesgpearce/flow,samwgoldman/flow,mroch/flow,JonathanUsername/flow,samwgoldman/flow,facebook/flow,TiddoLangerak/flow,nmote/flow,facebook/flow,samwgoldman/flow,JonathanUsername/flow,claudiopro/flow,gabelevi/flow,MichaelDeBoey/flow,MichaelDeBoey/flow,TiddoLangerak/flow,ylu1317/flow,popham/flow,jamesgpearce/flow,jamesgpearce/flow,nmote/flow,JonathanUsername/flow,jamesgpearce/flow