Flush pending incoming messages when writing status
As a bonus, correctly report was_cancelled when the server writes error
diff --git a/test/core/end2end/tests/max_concurrent_streams.c b/test/core/end2end/tests/max_concurrent_streams.c
index 8cfa15a..792d757 100644
--- a/test/core/end2end/tests/max_concurrent_streams.c
+++ b/test/core/end2end/tests/max_concurrent_streams.c
@@ -166,7 +166,7 @@
GPR_ASSERT(0 == strcmp(details, "xyz"));
GPR_ASSERT(0 == strcmp(call_details.method, "/foo"));
GPR_ASSERT(0 == strcmp(call_details.host, "foo.test.google.fr:1234"));
- GPR_ASSERT(was_cancelled == 0);
+ GPR_ASSERT(was_cancelled == 1);
gpr_free(details);
grpc_metadata_array_destroy(&initial_metadata_recv);