use is_one instead of Fqk::one

Author: zhenfeizhang

src/multilinear_pc/mod.rs

@@ -225,7 +225,7 @@ impl<E: PairingEngine> MultilinearPC<E> {
             E::G2Prepared::from(verifier_param.h),
         ));
 
-        E::product_of_pairings(pairings.iter()) == E::Fqk::one()
+        E::product_of_pairings(pairings.iter()).is_one()
     }
 }