Made mul_bits_be take a ref to self

curve25519-dalek/src/montgomery.rs

@@ -158,7 +158,7 @@ impl MontgomeryPoint {
     /// Curve25519 uses _clamped multiplication_, explained
     /// [here](https://neilmadden.blog/2020/05/28/whats-the-curve25519-clamping-all-about/).
     /// When in doubt, use [`Self::mul_clamped`].
-    pub fn mul_bits_be(self, bits: impl Iterator<Item = bool>) -> MontgomeryPoint {
+    pub fn mul_bits_be(&self, bits: impl Iterator<Item = bool>) -> MontgomeryPoint {
         // Algorithm 8 of Costello-Smith 2017
         let affine_u = FieldElement::from_bytes(&self.0);
         let mut x0 = ProjectivePoint::identity();