[NFC] DiagnosticVerifier: Remove redundant variable
[NFC] DiagnosticVerifier: Remove redundant variable

glessard/swift,rudkx/swift,atrick/swift,glessard/swift,roambotics/swift,gregomni/swift,apple/swift,ahoppen/swift,glessard/swift,JGiola/swift,gregomni/swift,benlangmuir/swift,gregomni/swift,atrick/swift,apple/swift,roambotics/swift,rudkx/swift,benlangmuir/swift,glessard/swift,atrick/swift,roambotics/swift,JGiola/swift,gregomni/swift,glessard/swift,JGiola/swift,ahoppen/swift,atrick/swift,rudkx/swift,atrick/swift,gregomni/swift,apple/swift,apple/swift,benlangmuir/swift,benlangmuir/swift,gregomni/swift,ahoppen/swift,roambotics/swift,rudkx/swift,apple/swift,benlangmuir/swift,atrick/swift,ahoppen/swift,rudkx/swift,JGiola/swift,glessard/swift,roambotics/swift,roambotics/swift,rudkx/swift,JGiola/swift,benlangmuir/swift,ahoppen/swift,JGiola/swift,ahoppen/swift,apple/swift