NAN: Fix NAN subscribe id reset issue

Reset the saved subscribe id during sta_reset_default and
nan op off. This subscribe id is being used for sending
subscribe update request.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
diff --git a/nan.c b/nan.c
index 8d9b97c..b9286b8 100644
--- a/nan.c
+++ b/nan.c
@@ -1718,6 +1718,7 @@
 	       sizeof(global_publish_service_name));
 	global_publish_service_name_len = 0;
 	global_publish_id = 0;
+	global_subscribe_id = 0;
 
 	sigma_nan_data_end(dut, cmd);
 	nan_data_interface_delete(0, global_interface_handle, (char *) "nan0");
@@ -1787,6 +1788,7 @@
 			       sizeof(global_publish_service_name));
 			global_publish_service_name_len = 0;
 			global_publish_id = 0;
+			global_subscribe_id = 0;
 			send_resp(dut, conn, SIGMA_COMPLETE, "NULL");
 		}
 	}