[libgfbgraph] simple-authorizer: NULL parameter check for a public api

[Leesoo Ahn <yisooan src gnome org>]

commit 9bbbb8ad1fcd4cc583961326efb9dbb68a8e5ab7
Author: Leesoo Ahn <yisooan fedoraproject org>
Date:   Sat Oct 26 16:22:32 2019 +0900

    simple-authorizer: NULL parameter check for a public api

 gfbgraph/gfbgraph-simple-authorizer.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gfbgraph/gfbgraph-simple-authorizer.c b/gfbgraph/gfbgraph-simple-authorizer.c
index 1f4d6e9..6e503c4 100644
--- a/gfbgraph/gfbgraph-simple-authorizer.c
+++ b/gfbgraph/gfbgraph-simple-authorizer.c
@@ -203,5 +203,7 @@ gfbgraph_simple_authorizer_refresh_authorization (GFBGraphAuthorizer *iface, GCa
 GFBGraphSimpleAuthorizer*
 gfbgraph_simple_authorizer_new (const gchar *access_token)
 {
+        g_return_val_if_fail (access_token != NULL, NULL);
+
         return GFBGRAPH_SIMPLE_AUTHORIZER (g_object_new (GFBGRAPH_TYPE_SIMPLE_AUTHORIZER, "access-token", 
access_token, NULL));
 }