[ril] Fix RilCellInfo object leak. JB#49798

On some devices RIL requires to reset the modem while switching radio
capabilities. During this procedure all associated objects should be
disposed and replaced by new instances. This patch fixes a memory
leak through RilCellInfo object.

ofono/drivers/ril/ril_plugin.c

@@ -384,6 +384,7 @@ static void ril_plugin_shutdown_slot(ril_slot *slot, gboolean kill_io)
 		}
 
 		if (slot->cell_info) {
+			sailfish_manager_set_cell_info(slot->handle, NULL);
 			sailfish_cell_info_unref(slot->cell_info);
 			slot->cell_info = NULL;
 		}
@@ -1041,13 +1042,13 @@ static void ril_plugin_slot_connected(ril_slot *slot)
 				slot->path, slot->config.techs, slot->imei,
 				slot->imeisv, ril_plugin_sim_state(slot),
 				slot->slot_flags);
-		sailfish_manager_set_cell_info(slot->handle, slot->cell_info);
 		grilio_channel_set_enabled(slot->io, slot->handle->enabled);
 
 		/* Check if this was the last slot we were waiting for */
 		ril_plugin_check_if_started(plugin);
 	}
 
+	sailfish_manager_set_cell_info(slot->handle, slot->cell_info);
 	ril_plugin_check_modem(slot);
 	ril_plugin_check_ready(slot);
 }