Put guards around display_server_get_vt()

diff --git a/src/display-server.c b/src/display-server.c
index 1681fe3e6f94e0c0667d6feec003b87231193a01..5042b38961bc9c78784ff3737eb8e4b4112c65c9 100644 (file)
--- a/src/display-server.c
+++ b/src/display-server.c
@@ -70,6 +70,7 @@ display_server_real_get_can_share (DisplayServer *server)
 gint
 display_server_get_vt (DisplayServer *server)
 {
+    g_return_val_if_fail (server != NULL, -1);
     return DISPLAY_SERVER_GET_CLASS (server)->get_vt (server);
 }