nat: Assign the connection inside the new helper function.
diff --git a/openbsc/src/nat/bsc_nat_utils.c b/openbsc/src/nat/bsc_nat_utils.c
index b420f5e..a412f73 100644
--- a/openbsc/src/nat/bsc_nat_utils.c
+++ b/openbsc/src/nat/bsc_nat_utils.c
@@ -45,6 +45,7 @@
 	if (!con)
 		return NULL;
 
+	con->nat = nat;
 	return con;
 }