dbus_g_bus_get return value

[Leonardo Boiko]

Thank you for the help, but I understood the reason for the failure. 
I'm sorry if I wasn't clear.  My issue is not with the function 
returning an error, it is with the sample tutorial code not detecting 
this error.

If you check for "error != NULL", when there is no session bus, the 
program will print an error message and abort.  However, it checks for 
"connection == NULL", which fails because dbus_g_bus_get returned 
garbage, and the program tries to use the invalid connection.
-- 
Leonardo Boiko