nacc: Improve log line failing to establish CTRL neigh conn

Change-Id: Ic92158f9fe986ff427ee2ed2cfbf95549e348746
diff --git a/src/nacc_fsm.c b/src/nacc_fsm.c
index fcf4b58..510b3d8 100644
--- a/src/nacc_fsm.c
+++ b/src/nacc_fsm.c
@@ -316,8 +316,9 @@
 				 NULL, 0, pcu->vty.neigh_ctrl_addr, pcu->vty.neigh_ctrl_port,
 				 OSMO_SOCK_F_CONNECT);
 	if (rc < 0) {
-		LOGPFSML(fi, LOGL_ERROR, "Can't connect to CTRL @ %s:%u\n",
-		     pcu->vty.neigh_ctrl_addr, pcu->vty.neigh_ctrl_port);
+		LOGPFSML(fi, LOGL_ERROR,
+			"Failed to establish CTRL (neighbor resolution) connection to BSC r=%s:%u\n\n",
+			pcu->vty.neigh_ctrl_addr, pcu->vty.neigh_ctrl_port);
 		goto err_term;
 	}