Fix bug in prioritization

src/proto/streams/prioritize.rs

@@ -228,6 +228,7 @@ impl<B> Prioritize<B>
     {
         // First check if there are any data chunks to take back
         if let Some(frame) = dst.take_last_data_frame() {
+            if frame.payload().has_remaining() {
                 let mut stream = store.resolve(frame.payload().stream);
 
                 let frame = frame.map(|prioritized| {
@@ -237,11 +238,12 @@ impl<B> Prioritize<B>
 
                 self.push_back_frame(frame.into(), &mut stream);
 
-            true
-        } else {
-            false
+                return true;
             }
         }
+
+        false
+    }
 }
 
 /// Push the stream onto the `pending_send` list. Returns true if the sender was