fix omitempty for DebugAddress, make it a pointer

Author: magicxyyz

params/config_arbitrum.go

@@ -55,10 +55,10 @@ type ArbitrumChainParams struct {
 	InitialArbOSVersion       uint64
 	InitialChainOwner         common.Address
 	GenesisBlockNum           uint64
-	MaxCodeSize               uint64         `json:"MaxCodeSize,omitempty"`     // Maximum bytecode to permit for a contract. 0 value implies params.DefaultMaxCodeSize
-	MaxInitCodeSize           uint64         `json:"MaxInitCodeSize,omitempty"` // Maximum initcode to permit in a creation transaction and create instructions. 0 value implies params.DefaultMaxInitCodeSize
-	DebugBlock                uint64         `json:"DebugBlock,omitempty"`
-	DebugAddress              common.Address `json:"DebugAddress,omitempty"`
+	MaxCodeSize               uint64          `json:"MaxCodeSize,omitempty"`     // Maximum bytecode to permit for a contract. 0 value implies params.DefaultMaxCodeSize
+	MaxInitCodeSize           uint64          `json:"MaxInitCodeSize,omitempty"` // Maximum initcode to permit in a creation transaction and create instructions. 0 value implies params.DefaultMaxInitCodeSize
+	DebugBlock                uint64          `json:"DebugBlock,omitempty"`
+	DebugAddress              *common.Address `json:"DebugAddress,omitempty"`
 }
 
 func (c *ChainConfig) IsArbitrum() bool {