trie/utils: remove unneeded initialization (#30472)

Author: zhiqiangxu

trie/utils/verkle.go

@@ -156,10 +156,6 @@ func GetTreeKey(address []byte, treeIndex *uint256.Int, subIndex byte) []byte {
 func GetTreeKeyWithEvaluatedAddress(evaluated *verkle.Point, treeIndex *uint256.Int, subIndex byte) []byte {
 	var poly [5]fr.Element
 
-	poly[0].SetZero()
-	poly[1].SetZero()
-	poly[2].SetZero()
-
 	// little-endian, 32-byte aligned treeIndex
 	var index [32]byte
 	for i := 0; i < len(treeIndex); i++ {
@@ -297,8 +293,6 @@ func evaluateAddressPoint(address []byte) *verkle.Point {
 	}
 	var poly [3]fr.Element
 
-	poly[0].SetZero()
-
 	// 32-byte address, interpreted as two little endian
 	// 16-byte numbers.
 	verkle.FromLEBytes(&poly[1], address[:16])