log: fix number format for domain indicator

CN_DomainIndicator_t is a long, so use %l format.
Error was introduced in recent 2b5021fd8d445f0ca4f28e0ea71a19cd52724e57.

Fixes: CID#157119
Change-Id: I22f49d45bc87897beb24a6b1eee6c83da3e57b0f
diff --git a/src/hnbgw_rua.c b/src/hnbgw_rua.c
index 0ca64d3..47d33f0 100644
--- a/src/hnbgw_rua.c
+++ b/src/hnbgw_rua.c
@@ -348,7 +348,7 @@
 		cn = hnb->gw->cnlink_ps;
 		break;
 	default:
-		LOGP(DRUA, LOGL_ERROR, "Invalid CN_DomainIndicator: %u\n",
+		LOGP(DRUA, LOGL_ERROR, "Invalid CN_DomainIndicator: %l\n",
 		     ies.cN_DomainIndicator);
 		rc = -1;
 		goto error_free;
@@ -394,7 +394,7 @@
 		cn = hnb->gw->cnlink_ps;
 		break;
 	default:
-		LOGP(DRUA, LOGL_ERROR, "Invalid CN_DomainIndicator: %u\n",
+		LOGP(DRUA, LOGL_ERROR, "Invalid CN_DomainIndicator: %l\n",
 		     ies.cN_DomainIndicator);
 		rc = -1;
 		goto error_free;