ostree: do not print the usage on each G_IO_ERROR_NOT_SUPPORTED

It may have a different meaning, and the usage screen is not helpful.

Print the usage screen only when the command is not found.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

src/ostree/main.c

@@ -75,8 +75,6 @@ main (int    argc,
   g_set_prgname (argv[0]);
 
   ret = ostree_run (argc, argv, commands, &error);
-  if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED))
-    ostree_usage (commands, TRUE);
 
   if (error != NULL)
     {

src/ostree/ot-main.c

@@ -190,6 +190,7 @@ ostree_run (int    argc,
             {
               g_set_error (&error, G_IO_ERROR, G_IO_ERROR_FAILED,
                            "Unknown command '%s'", command_name);
+              ostree_usage (commands, TRUE);
             }
         }