remove useless mut

src/semi_avid.rs

@@ -730,7 +730,7 @@ mod tests {
 
         let (k, n) = (3, 6_usize);
 
-        let mut bytes = bytes();
+        let bytes = bytes();
 
         let powers = setup::<Fr, G1Projective>(bytes.len(), &mut rng).unwrap();
         let encoding_mat = Matrix::random(k, n, &mut rng);