MEDIUM: streams: Don't close the connection in back_handle_st_rdy().

In back_handle_st_rdy(), don't bother trying to close the connection, it
should be taken care of somewhere else.
diff --git a/src/backend.c b/src/backend.c
index 930895b..45fe536 100644
--- a/src/backend.c
+++ b/src/backend.c
@@ -2071,8 +2071,6 @@
 	struct stream_interface *si = &s->si[1];
 	struct channel *req = &s->req;
 	struct channel *rep = &s->res;
-	struct conn_stream *srv_cs = objt_cs(si->end);
-	struct connection *conn = srv_cs ? srv_cs->conn : objt_conn(si->end);
 
 	DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_SI_ST, s);
 	/* We know the connection at least succeeded, though it could have
@@ -2110,11 +2108,6 @@
 
 		/* retryable error ? */
 		if (si->flags & SI_FL_ERR) {
-			if (!(s->flags & SF_SRV_REUSED) && conn) {
-				conn_stop_tracking(conn);
-				conn_full_close(conn);
-			}
-
 			if (!si->err_type)
 				si->err_type = SI_ET_CONN_ERR;
 			si->state = SI_ST_CER;