fix build.

light-clients/common/src/lib.rs

@@ -194,7 +194,7 @@ pub fn decode_timestamp_extrinsic(ext: &Vec<u8>) -> Result<u64, anyhow::Error> {
 	// https://github.com/paritytech/substrate/blob/d602397a0bbb24b5d627795b797259a44a5e29e9/primitives/trie/src/lib.rs#L99-L101
 	// Decoding from the [2..] because the timestamp inmherent has two extra bytes before the call
 	// that represents the call length and the extrinsic version.
-	let ret: Compact<u64> = codec::Decode::decode(&mut &ext[5..])
+	let timestamp: Compact<u64> = codec::Decode::decode(&mut &ext[5..])
 		.map_err(|err| anyhow!("Failed to decode extrinsic: {err}"))?;
 	Ok(timestamp.into())
 }