*: fix all unused warnings

From golangci-lint.

pkg/compiler/codegen.go

@@ -1521,33 +1521,6 @@ func getJumpForToken(tok token.Token, typ types.Type) (opcode.Opcode, bool) {
 	return 0, false
 }
 
-// getByteArray returns byte array value from constant expr.
-// Only literals are supported.
-func (c *codegen) getByteArray(expr ast.Expr) []byte {
-	switch t := expr.(type) {
-	case *ast.CompositeLit:
-		if !isByteSlice(c.typeOf(t.Type)) {
-			return nil
-		}
-		buf := make([]byte, len(t.Elts))
-		for i := 0; i < len(t.Elts); i++ {
-			t := c.typeAndValueOf(t.Elts[i])
-			val, _ := constant.Int64Val(t.Value)
-			buf[i] = byte(val)
-		}
-		return buf
-	case *ast.CallExpr:
-		if tv := c.typeAndValueOf(t.Args[0]); tv.Value != nil {
-			val := constant.StringVal(tv.Value)
-			return []byte(val)
-		}
-
-		return nil
-	default:
-		return nil
-	}
-}
-
 func (c *codegen) convertSyscall(f *funcScope, expr *ast.CallExpr) {
 	for _, arg := range expr.Args[1:] {
 		ast.Walk(c, arg)

pkg/core/mpt/batch_test.go

@@ -277,6 +277,8 @@ func TestTrie_PutBatch(t *testing.T) {
 	testPut(t, ps, tr1, tr2)
 }
 
+var _ = printNode
+
 // This function is unused, but is helpful for debugging
 // as it provides more readable Trie representation compared to
 // `spew.Dump()`

pkg/core/native/name_service.go

@@ -711,17 +711,6 @@ func (sl stringList) index(s string) (int, bool) {
 	return index, index < len(sl) && sl[index] == s
 }
 
-func (sl *stringList) remove(s string) bool {
-	index, has := sl.index(s)
-	if !has {
-		return false
-	}
-
-	copy((*sl)[index:], (*sl)[index+1:])
-	*sl = (*sl)[:len(*sl)-1]
-	return true
-}
-
 func (sl *stringList) add(s string) bool {
 	index, has := sl.index(s)
 	if has {

pkg/core/native/nonfungible.go

@@ -305,6 +305,8 @@ func (n *nonfungible) postTransfer(ic *interop.Context, from, to *util.Uint160,
 	}
 }
 
+var _ = (*nonfungible).burn // fix unused warning
+
 func (n *nonfungible) burn(ic *interop.Context, tokenID []byte) {
 	key := n.getTokenKey(tokenID)
 	n.burnByKey(ic, key)

pkg/services/oracle/transaction.go

@@ -117,15 +117,3 @@ func finalizeTx(oracleNodes keys.PublicKeys, tx *transaction.Transaction, txSigs
 	tx.Scripts[1].InvocationScript = w.Bytes()
 	return true
 }
-
-func (t *incompleteTx) getRequest() *state.OracleRequest {
-	t.RLock()
-	defer t.RUnlock()
-	return t.request
-}
-
-func (t *incompleteTx) getTime() time.Time {
-	t.RLock()
-	defer t.RUnlock()
-	return t.time
-}