Fix bug in ReliableQuicStream::WritevData() where if the write failed and the connection was closed…

net/quic/reliable_quic_stream.cc

Index: net/quic/reliable_quic_stream.cc
diff --git a/net/quic/reliable_quic_stream.cc b/net/quic/reliable_quic_stream.cc
index 1efad1902607faa34274df5b90918cff9dc5c2a9..89e865ad6ad29f297b95d4648c070ccab8c72edf 100644
--- a/net/quic/reliable_quic_stream.cc
+++ b/net/quic/reliable_quic_stream.cc
@@ -325,6 +325,12 @@ QuicConsumedData ReliableQuicStream::WritevData(
 
   AddBytesSent(consumed_data.bytes_consumed);
 
+  // The write may have generated a write error causing this stream to be
+  // closed. If so, simply return without marking the stream write blocked.
+  if (write_side_closed_) {
+    return consumed_data;
+  }
+
   if (consumed_data.bytes_consumed == write_length) {
     if (!fin_with_zero_data) {
       MaybeSendBlocked();