fix(rust/sled): fix sled errors

_rsdemo/sled/sled.go

@@ -1,4 +1,4 @@
-package sled
+package main
 
 import (
 	"github.com/goplus/llgo/c"
@@ -6,11 +6,12 @@ import (
 )
 
 func main() {
-	c.Printf(c.Str("helloworld\n"))
+	//c.Printf(c.Str("helloworld\n"))
+	var valueLen c.Ulong
 	conf := &sled.SledConfig{}
 	conf.SetPath(c.Str("./db.sled"))
-	db := conf.OpenDB(conf)
+	db := conf.OpenDB()
 	db.Set(c.Str("key"), 3, c.Str("value"), 5)
-	value := db.Get(c.Str("key"), 3)
+	value := db.Get(c.Str("key"), 3, &valueLen)
 	c.Printf(c.Str("value: %s\n"), value)
 }