Address various clippy warnings/errors in zcash_primitives

zcash_primitives/src/primitives.rs

@@ -97,10 +97,7 @@ impl<E: JubjubEngine> ViewingKey<E> {
         diversifier.g_d(params).map(|g_d| {
             let pk_d = g_d.mul(self.ivk(), params);
 
-            PaymentAddress {
-                pk_d: pk_d,
-                diversifier: diversifier,
-            }
+            PaymentAddress { pk_d, diversifier }
         })
     }
 }
@@ -145,9 +142,9 @@ impl<E: JubjubEngine> PaymentAddress<E> {
         params: &E::Params,
     ) -> Option<Note<E>> {
         self.g_d(params).map(|g_d| Note {
-            value: value,
+            value,
             r: randomness,
-            g_d: g_d,
+            g_d,
             pk_d: self.pk_d.clone(),
         })
     }