CLEANUP: stconn: rename remaining management functions from cs_* to sc_*

This is the end of the renaming for the generic SC management functions
and macros:

cs_applet_process() -> sc_applet_process()
cs_attach_applet()  -> sc_attach_applet()
cs_attach_mux()     -> sc_attach_mux()
cs_attach_strm()    -> sc_attach_strm()
cs_detach_app()     -> sc_detach_app()
cs_detach_endp()    -> sc_detach_endp()
cs_notify()         -> sc_notify()
cs_reset_endp()     -> sc_reset_endp()
cs_state_in()       -> sc_state_in()
cs_update()         -> sc_update()
cs_update_rx()      -> sc_update_rx()
cs_update_tx()      -> sc_update_tx()
IS_HTX_CS()         -> IS_HTX_SC()
diff --git a/src/mux_h2.c b/src/mux_h2.c
index dde2392..cfffd69 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -1693,7 +1693,7 @@
 		goto out;
 	}
 
-	if (cs_attach_mux(cs, h2s, h2c->conn) < 0) {
+	if (sc_attach_mux(cs, h2s, h2c->conn) < 0) {
 		TRACE_ERROR("Failed to allocate a new stream", H2_EV_H2S_NEW, h2c->conn);
 		h2s_destroy(h2s);
 		h2s = NULL;