修复bytehelper & VlInt中的已知bug

src/main/java/component/TTL.java

@@ -91,7 +91,12 @@ public class TTL implements IEncodingAble {
         if(!TLV.expectType(block.getType(),new VlInt(TLV.TlvTTL))){
             return false;
         }
-        long value=TLV.readNonNegativeInteger(block.getValue(),0,block.getLength().getVlIntValue2Int());
+        long value= 0;
+        try {
+            value = TLV.readNonNegativeInteger(block.getValue(),0,block.getLength().getVlIntValue2Int());
+        } catch (VlIntException e) {
+            e.printStackTrace();
+        }
         if(value<0){
             return false;
         }