core/vm: remove redundant error checks (#29692)

Author: AaronChen0

core/vm/contracts.go

@@ -1123,9 +1123,6 @@ func (c *bls12381MapG1) Run(input []byte) ([]byte, error) {
 
 	// Compute mapping
 	r := bls12381.MapToG1(fe)
-	if err != nil {
-		return nil, err
-	}
 
 	// Encode the G1 point to 128 bytes
 	return encodePointG1(&r), nil
@@ -1159,9 +1156,6 @@ func (c *bls12381MapG2) Run(input []byte) ([]byte, error) {
 
 	// Compute mapping
 	r := bls12381.MapToG2(bls12381.E2{A0: c0, A1: c1})
-	if err != nil {
-		return nil, err
-	}
 
 	// Encode the G2 point to 256 bytes
 	return encodePointG2(&r), nil