chore: fix linting issue (redundant loop index copy)

Signed-off-by: Frédéric BIDON <fredbi@yahoo.com>

Author: fredbi

jsonname/name_provider.go

@@ -40,7 +40,6 @@ func NewNameProvider() *NameProvider {
 
 func buildnameIndex(tpe reflect.Type, idx, reverseIdx map[string]string) {
 	for targetDes := range tpe.Fields() {
-		targetDes := targetDes
 
 		if targetDes.PkgPath != "" { // unexported
 			continue