gfe-relnote: n/a, add a missing space in log message.

PiperOrigin-RevId: 250759168
Change-Id: I9e5fba39b14f3f6a61f8d3cf983259b1797bdd6d
diff --git a/quic/core/quic_stream.cc b/quic/core/quic_stream.cc
index cf19e31..af8079c 100644
--- a/quic/core/quic_stream.cc
+++ b/quic/core/quic_stream.cc
@@ -608,7 +608,7 @@
 
   if (write_side_closed_) {
     QUIC_DLOG(ERROR) << ENDPOINT << "Stream " << id()
-                     << "attempting to write when the write side is closed";
+                     << " attempting to write when the write side is closed";
     if (type_ == READ_UNIDIRECTIONAL) {
       CloseConnectionWithDetails(
           QUIC_TRY_TO_WRITE_DATA_ON_READ_UNIDIRECTIONAL_STREAM,