Bug 1343008 - Fix combination of H2, tls1.3 early-data and not safe http methods. r=mcmanus

netwerk/protocol/http/Http2Stream.cpp

@@ -1480,8 +1480,8 @@ bool
 Http2Stream::Do0RTT()
 {
   MOZ_ASSERT(mTransaction);
-  mAttempting0RTT = true;
-  return mTransaction->Do0RTT();
+  mAttempting0RTT = mTransaction->Do0RTT();
+  return mAttempting0RTT;
 }
 
 nsresult