CLEANUP: mux-h2: remove unused goto "out_free_h2s"

Since commit fa8aa867b915 ("MEDIUM: connections: Change struct
wait_list to wait_event.") we no longer use this section.

this should fix github issue #437

Signed-off-by: William Dauchy <w.dauchy@criteo.com>
diff --git a/src/mux_h2.c b/src/mux_h2.c
index be9dae9..6ec8d6c 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -1347,9 +1347,6 @@
 
 	TRACE_LEAVE(H2_EV_H2S_NEW, h2c->conn, h2s);
 	return h2s;
-
- out_free_h2s:
-	pool_free(pool_head_h2s, h2s);
  out:
 	TRACE_DEVEL("leaving in error", H2_EV_H2S_ERR|H2_EV_H2S_END, h2c->conn);
 	return NULL;