cleanup validate() no need to return kernel sums (#3456)

core/src/core/block.rs

@@ -739,7 +739,7 @@ impl Block {
 		&self,
 		prev_kernel_offset: &BlindingFactor,
 		verifier: Arc<RwLock<dyn VerifierCache>>,
-	) -> Result<Commitment, Error> {
+	) -> Result<(), Error> {
 		self.body.validate(Weighting::AsBlock, verifier)?;
 
 		self.verify_kernel_lock_heights()?;
@@ -748,12 +748,12 @@ impl Block {
 
 		// take the kernel offset for this block (block offset minus previous) and
 		// verify.body.outputs and kernel sums
-		let (_utxo_sum, kernel_sum) = self.verify_kernel_sums(
+		self.verify_kernel_sums(
 			self.header.overage(),
 			self.block_kernel_offset(prev_kernel_offset.clone())?,
 		)?;
 
-		Ok(kernel_sum)
+		Ok(())
 	}
 
 	/// Validate the coinbase.body.outputs generated by miners.