rm unused fn

src/frame/data.rs

@@ -44,10 +44,6 @@ impl<T> Data<T> {
         self.flags.is_end_stream()
     }
 
-    pub fn set_end_stream(&mut self) {
-        self.flags.set_end_stream()
-    }
-
     pub fn head(&self) -> Head {
         Head::new(Kind::Data, self.flags.into(), self.stream_id)
     }