Correct reference test blobgas calculation (#6107)

* Correct reference test blobgas calculation

Fix tpyo that resulted in an NPE in t8n blob gas calculations.

Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>

* changelog

Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>

* spotless

Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>

---------

Signed-off-by: Danno Ferrin <danno.ferrin@swirldslabs.com>

CHANGELOG.md

@@ -26,6 +26,7 @@
 
 - Upgrade netty to address CVE-2023-44487, CVE-2023-34462 [#6100](https://github.com/hyperledger/besu/pull/6100)
 - Upgrade grpc to address CVE-2023-32731, CVE-2023-33953, CVE-2023-44487, CVE-2023-4785 [#6100](https://github.com/hyperledger/besu/pull/6100)
+- Fix blob gas calculation in reference tests [#6107](https://github.com/hyperledger/besu/pull/6107)
 
 ---
 

ethereum/referencetests/src/main/java/org/hyperledger/besu/ethereum/referencetests/ReferenceTestEnv.java

@@ -233,7 +233,7 @@ public BlockHeader updateFromParentValues(final ProtocolSpec protocolSpec) {
               protocolSpec
                   .getGasCalculator()
                   .computeExcessBlobGas(
-                      Long.decode(parentExcessBlobGas), Long.decode(parentGasUsed))));
+                      Long.decode(parentExcessBlobGas), Long.decode(parentBlobGasUsed))));
     }
 
     return builder.buildBlockHeader();