fix decode version 0 rc when in version 1 mode

llarp/router_contact.cpp

@@ -266,8 +266,12 @@ namespace llarp
   bool
   RouterContact::DecodeVersion_0(llarp_buffer_t* buf)
   {
-    signed_bt_dict = std::string(reinterpret_cast<char*>(buf->cur), buf->size_left());
-    return bencode_decode_dict(*this, buf);
+    auto begin = reinterpret_cast<char*>(buf->cur);
+    if (not bencode_decode_dict(*this, buf))
+      return false;
+    auto end = reinterpret_cast<char*>(buf->cur);
+    signed_bt_dict = std::string(begin, std::distance(begin, end));
+    return true;
   }
 
   bool