Fix clippy errors in relay-codegen
Fix clippy errors in relay-codegen

Reviewed By: kassens

Differential Revision: D26773111

fbshipit-source-id: 65886a3f47e4918133f265cd8265127a18fc0bae

wincent/relay,josephsavona/relay,xuorig/relay,voideanvalue/relay,kassens/relay,voideanvalue/relay,wincent/relay,xuorig/relay,facebook/relay,kassens/relay,wincent/relay,yungsters/relay,wincent/relay,wincent/relay,voideanvalue/relay,xuorig/relay,voideanvalue/relay,atxwebs/relay,facebook/relay,facebook/relay,kassens/relay,yungsters/relay,atxwebs/relay,facebook/relay,kassens/relay,xuorig/relay,atxwebs/relay,xuorig/relay,kassens/relay,kassens/relay,facebook/relay,xuorig/relay,atxwebs/relay,yungsters/relay,wincent/relay,josephsavona/relay,facebook/relay,voideanvalue/relay,voideanvalue/relay,josephsavona/relay