consensus/ethash: remove unnecessary type declaration (#17529)

consensus/ethash/consensus.go

@@ -38,10 +38,10 @@ import (
 
 // Ethash proof-of-work protocol constants.
 var (
-	FrontierBlockReward    *big.Int = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
-	ByzantiumBlockReward   *big.Int = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
-	maxUncles                       = 2                 // Maximum number of uncles allowed in a single block
-	allowedFutureBlockTime          = 15 * time.Second  // Max time from current time allowed for blocks, before they're considered future blocks
+	FrontierBlockReward    = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
+	ByzantiumBlockReward   = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
+	maxUncles              = 2                 // Maximum number of uncles allowed in a single block
+	allowedFutureBlockTime = 15 * time.Second  // Max time from current time allowed for blocks, before they're considered future blocks
 )
 
 // Various error messages to mark blocks invalid. These should be private to