MINOR: conn-stream/applet: Stop setting appctx as the endpoint context

The appctx is already the endpoint target. It is confusing to also use it to
set the endpoint context. So, never set the endpoint ctx when an appctx is
created or attached to an existing conn-stream.
diff --git a/src/applet.c b/src/applet.c
index 42d46f8..d5eb46a 100644
--- a/src/applet.c
+++ b/src/applet.c
@@ -51,7 +51,6 @@
 		if (!endp)
 			goto fail_endp;
 		endp->target = appctx;
-		endp->ctx = appctx;
 		endp->flags |= (CS_EP_T_APPLET|CS_EP_ORPHAN);
 	}
 	appctx->endp = endp;
diff --git a/src/conn_stream.c b/src/conn_stream.c
index 8bf9d52..7fc3a49 100644
--- a/src/conn_stream.c
+++ b/src/conn_stream.c
@@ -276,10 +276,9 @@
  * removed. This function is called by a stream when a backend applet is
  * registered.
  */
-static void cs_attach_applet(struct conn_stream *cs, void *target, void *ctx)
+static void cs_attach_applet(struct conn_stream *cs, void *target)
 {
 	cs->endp->target = target;
-	cs->endp->ctx = ctx;
 	cs->endp->flags |= CS_EP_T_APPLET;
 	cs->endp->flags &= ~CS_EP_DETACHED;
 	if (cs_strm(cs)) {
@@ -479,7 +478,7 @@
 	appctx = appctx_new_here(app, cs->endp);
 	if (!appctx)
 		return NULL;
-	cs_attach_applet(cs, appctx, appctx);
+	cs_attach_applet(cs, appctx);
 	appctx->t->nice = __cs_strm(cs)->task->nice;
 	cs_cant_get(cs);
 	appctx_wakeup(appctx);