Fix variable name
Fix variable name

Summary: Fix a variable name to be consistent with naming conventions.

Test Plan: `arc lint`

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: aurelijus, Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11140

jra3/arcanist,Khan/arcanist,jra3/arcanist,eSpark/arcanist,codelabs-ch/arcanist,alexmv/arcanist,wxstars/arcanist,PageUpPeopleOrg/arcanist-patches,wikimedia/phabricator-arcanist,kevinseelbach/arcanist,KieranHayes/arcanist,eSpark/arcanist,wharris/arcanist,wharris/arcanist,r4nt/arcanist,jra3/arcanist,sneakpeeq/arcanist,folsom-labs/arcanist,wxstars/arcanist,coursera/arcanist,hach-que/arcanist,zhihu/arcanist,jra3/arcanist,haskell-infra/arcanist,calblueprint/arcanist,Khan/arcanist,coursera/arcanist,PageUpPeopleOrg/arcanist-patches,phacility/arcanist,Khan/arcanist,memsql/arcanist,alexmv/arcanist,aik099/arcanist,calblueprint/arcanist,phacility/arcanist,eSpark/arcanist,eSpark/arcanist,fivestars/arcanist,Symplicity/arcanist,calblueprint/arcanist,haskell-infra/arcanist,aik099/arcanist,wxstars/arcanist,hach-que/arcanist,phacility/arcanist,chundongwang/arcanist,alexmv/arcanist,r4nt/arcanist,uber/arcanist,memsql/arcanist,aik099/arcanist,codelabs-ch/arcanist,calblueprint/arcanist,uber/arcanist,folsom-labs/arcanist,codelabs-ch/arcanist,chundongwang/arcanist,KieranHayes/arcanist,Symplicity/arcanist,phacility/arcanist,PageUpPeopleOrg/arcanist-patches,zhihu/arcanist,Symplicity/arcanist,memsql/arcanist,chundongwang/arcanist,haskell-infra/arcanist,sneakpeeq/arcanist,haskell-infra/arcanist,fivestars/arcanist,wikimedia/phabricator-arcanist,wikimedia/phabricator-arcanist,sneakpeeq/arcanist,phacility/arcanist,Symplicity/arcanist,PageUpPeopleOrg/arcanist-patches,alexmv/arcanist,wharris/arcanist,sneakpeeq/arcanist,kevinseelbach/arcanist,wharris/arcanist,memsql/arcanist,coursera/arcanist,hach-que/arcanist,folsom-labs/arcanist,aik099/arcanist,wikimedia/phabricator-arcanist,coursera/arcanist,r4nt/arcanist,chundongwang/arcanist,fivestars/arcanist,codelabs-ch/arcanist,folsom-labs/arcanist,wxstars/arcanist,Khan/arcanist,codelabs-ch/arcanist,zhihu/arcanist,zhihu/arcanist,KieranHayes/arcanist,uber/arcanist,uber/arcanist,fivestars/arcanist,KieranHayes/arcanist,hach-que/arcanist,kevinseelbach/arcanist,kevinseelbach/arcanist,r4nt/arcanist