all: remove unneeded parentheses (#21921)

* remove uneeded convertion type

* remove redundant type in composite literal

* omit explicit type where implicit

* remove unused redundant parenthesis

* remove redundant import alias duktape

crypto/bls12381/bls12_381_test.go

@@ -5,7 +5,7 @@ import (
 	"math/big"
 )
 
-var fuz int = 10
+var fuz = 10
 
 func randScalar(max *big.Int) *big.Int {
 	a, _ := rand.Int(rand.Reader, max)

crypto/signify/signify.go

@@ -46,7 +46,7 @@ func parsePrivateKey(key string) (k ed25519.PrivateKey, header []byte, keyNum []
 	if string(keydata[:2]) != "Ed" {
 		return nil, nil, nil, errInvalidKeyHeader
 	}
-	return ed25519.PrivateKey(keydata[40:]), keydata[:2], keydata[32:40], nil
+	return keydata[40:], keydata[:2], keydata[32:40], nil
 }
 
 // SignFile creates a signature of the input file.