Merge pull request #2181 from ljedrz/fix/2179

Don't preallocate in G2Prepared::read_le

curves/src/templates/bls12/g2.rs

@@ -65,7 +65,7 @@ impl<P: Bls12Parameters> ToBytes for G2Prepared<P> {
 impl<P: Bls12Parameters> FromBytes for G2Prepared<P> {
     fn read_le<R: Read>(mut reader: R) -> IoResult<Self> {
         let ell_coeffs_len: u32 = FromBytes::read_le(&mut reader)?;
-        let mut ell_coeffs = Vec::with_capacity(ell_coeffs_len as usize);
+        let mut ell_coeffs = Vec::new();
         for _ in 0..ell_coeffs_len {
             let coeff_1: Fp2<P::Fp2Params> = FromBytes::read_le(&mut reader)?;
             let coeff_2: Fp2<P::Fp2Params> = FromBytes::read_le(&mut reader)?;