fix: aws signer does not throw error on unnormalized sig

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Unreleased
 
+- Fix aws signer bug which maps un-normalized signature to error if no normalization occurs (in `aws::utils::decode_signature`)
 - `Transaction::from` will default to `Address::zero()`. Add `recover_from` and
   `recover_from_mut` methods for recovering the sender from signature, and also
   setting the same on tx [1075](https://github.com/gakonst/ethers-rs/pull/1075).

ethers-signers/src/aws/utils.rs

@@ -93,8 +93,6 @@ pub(super) fn decode_signature(resp: SignResponse) -> Result<KSig, AwsSignerErro
         .signature
         .ok_or_else(|| AwsSignerError::from("Signature not found in response".to_owned()))?;
 
-    let sig = KSig::from_der(&raw)?
-        .normalize_s()
-        .ok_or_else(|| AwsSignerError::from("Could not normalize `s`".to_owned()))?;
-    Ok(sig)
+    let sig = KSig::from_der(&raw)?;
+    Ok(sig.normalize_s().unwrap_or(sig))
 }