Remove an unnecessary guard
Remove an unnecessary guard

Summary:In code review for D3136035 yungsters suggested hoisting a guard up to the callsites. Turns out the callsites already have guards (either due to prior `invariant` calls or an explicit `if`), so the guard isn't needed at all (in fact, was in there as a remnant of an intermediate state I had while preparing that diff).

So, let's just remove the guard.
Closes https://github.com/facebook/relay/pull/1022

Reviewed By: kassens

Differential Revision: D3145369

Pulled By: wincent

fb-gh-sync-id: b607170f7b53fc687abad56b46a54896630074a4
fbshipit-source-id: b607170f7b53fc687abad56b46a54896630074a4

kassens/relay,rosskevin/relay,voideanvalue/relay,cesarandreu/relay,apalm/relay,facebook/relay,xuorig/relay,mroch/relay,facebook/relay,voideanvalue/relay,yungsters/relay,voideanvalue/relay,wincent/relay,rosskevin/relay,xuorig/relay,zpao/relay,chentsulin/relay,benjaminogles/relay,dbslone/relay,iamchenxin/relay,atxwebs/relay,yungsters/relay,wincent/relay,xuorig/relay,gabelevi/relay,apalm/relay,iamchenxin/relay,chentsulin/relay,josephsavona/relay,josephsavona/relay,josephsavona/relay,zpao/relay,chentsulin/relay,atxwebs/relay,xuorig/relay,apalm/relay,cesarandreu/relay,voideanvalue/relay,wincent/relay,voideanvalue/relay,freiksenet/relay,wincent/relay,wincent/relay,facebook/relay,chirag04/relay,xuorig/relay,benjaminogles/relay,cpojer/relay,zpao/relay,iamchenxin/relay,voideanvalue/relay,freiksenet/relay,cpojer/relay,mroch/relay,facebook/relay,kassens/relay,kassens/relay,facebook/relay,cpojer/relay,dbslone/relay,wincent/relay,benjaminogles/relay,yungsters/relay,iamchenxin/relay,atxwebs/relay,gabelevi/relay,chirag04/relay,gabelevi/relay,kassens/relay,kassens/relay,chirag04/relay,cesarandreu/relay,kassens/relay,freiksenet/relay,xuorig/relay,mroch/relay,cpojer/relay,atxwebs/relay,facebook/relay