Reuse `BlockHash` from `validate_pow()`

The `validate_pow()` method now returns the BlockHash since rust-bitcoin
v0.26.2 thanks to jkczyz's PR (rust-bitcoin/rust-bitcoin/pull/572).

diff --git a/lightning-block-sync/src/poll.rs b/lightning-block-sync/src/poll.rs
index 6e30d2e86d20d268529bd37d942492db810d84b6..4c6cb0c0600725e9cf3552045865e8b5be472199 100644 (file)
--- a/lightning-block-sync/src/poll.rs
+++ b/lightning-block-sync/src/poll.rs
@@ -59,12 +59,11 @@ impl Validate for BlockHeaderData {
        type T = ValidatedBlockHeader;
 
        fn validate(self, block_hash: BlockHash) -> BlockSourceResult<Self::T> {
-               self.header
+               let pow_valid_block_hash = self.header
                        .validate_pow(&self.header.target())
                        .or_else(|e| Err(BlockSourceError::persistent(e)))?;
 
-               // TODO: Use the result of validate_pow instead of recomputing the block hash once upstream.
-               if self.header.block_hash() != block_hash {
+               if pow_valid_block_hash != block_hash {
                        return Err(BlockSourceError::persistent("invalid block hash"));
                }
 
@@ -76,12 +75,11 @@ impl Validate for Block {
        type T = ValidatedBlock;
 
        fn validate(self, block_hash: BlockHash) -> BlockSourceResult<Self::T> {
-               self.header
+               let pow_valid_block_hash = self.header
                        .validate_pow(&self.header.target())
                        .or_else(|e| Err(BlockSourceError::persistent(e)))?;
 
-               // TODO: Use the result of validate_pow instead of recomputing the block hash once upstream.
-               if self.block_hash() != block_hash {
+               if pow_valid_block_hash != block_hash {
                        return Err(BlockSourceError::persistent("invalid block hash"));
                }