libctrl: Change controlif_setup so it returns the ctrl handle

nat: Catch up with controlif_setup API change
We now save a control handle reference in the nat
osmo-bsc: Catch up with controlif_setup API change
We now save a control handle reference in the gsm network
diff --git a/openbsc/src/osmo-bsc/osmo_bsc_main.c b/openbsc/src/osmo-bsc/osmo_bsc_main.c
index 63e1d8e..aa53eef 100644
--- a/openbsc/src/osmo-bsc/osmo_bsc_main.c
+++ b/openbsc/src/osmo-bsc/osmo_bsc_main.c
@@ -19,7 +19,6 @@
  */
 
 #include <openbsc/bss.h>
-#include <openbsc/control_cmd.h>
 #include <openbsc/debug.h>
 #include <openbsc/gsm_data.h>
 #include <openbsc/osmo_bsc.h>
@@ -29,6 +28,9 @@
 #include <openbsc/vty.h>
 #include <openbsc/ipaccess.h>
 
+#include <openbsc/control_cmd.h>
+#include <openbsc/control_if.h>
+
 #include <osmocom/core/application.h>
 #include <osmocom/core/linuxlist.h>
 #include <osmocom/core/talloc.h>
@@ -425,7 +427,8 @@
 	}
 	bsc_api_init(bsc_gsmnet, osmo_bsc_api());
 
-	controlif_setup(bsc_gsmnet, 4249);
+	bsc_gsmnet->ctrl = controlif_setup(bsc_gsmnet, 4249);
+
 	ctrl_cmd_install(CTRL_NODE_NET, &cmd_net_loc);
 	ctrl_cmd_install(CTRL_NODE_NET, &cmd_net_rf_lock);
 	ctrl_cmd_install(CTRL_NODE_TRX, &cmd_trx_rf_lock);