clippy: Remove useless actions

- Dropping a reference does nothing.
- Dropping a Copy type drops a copy.
- No need to clone the last usage of a variable.

src/poly/commitment/prover.rs

@@ -63,10 +63,8 @@ pub fn create_proof<C: CurveAffine, T: TranscriptWrite<C>>(
     let mut final_poly = s_poly * iota + px;
     let v = eval_polynomial(&final_poly, x);
     final_poly[0] = final_poly[0] - &v;
-    drop(px);
     let blind = s_poly_blind * Blind(iota) + blind;
     let mut blind = blind.0;
-    drop(s_poly_blind);
 
     // Initialize the vector `a` as the coefficients of the polynomial,
     // rounding up to the parameters.

src/poly/multiopen/prover.rs

@@ -104,7 +104,7 @@ where
     let x_4 = ChallengeX4::get(transcript);
 
     let (f_poly, f_blind_try) = q_polys.iter().zip(q_blinds.iter()).fold(
-        (f_poly.clone(), f_blind),
+        (f_poly, f_blind),
         |(f_poly, f_blind), (poly, blind)| {
             (
                 f_poly * *x_4 + poly.as_ref().unwrap(),