Tests: h2_limit_req.t cleanup.

h2_limit_req.t

diff --git a/h2_limit_req.t b/h2_limit_req.t
index f8e59bd..a93bb33 100644
--- a/h2_limit_req.t
+++ b/h2_limit_req.t
@@ -69,7 +69,7 @@
 $t->run();
 
 ###############################################################################
-my $sess;
+
 # request body delayed in limit_req
 
 my $s = Test::Nginx::HTTP2->new();