return value obsolete(?) from Glib::KeyFile::load_from_file

[robikarmann <robi k gmx ch>]

I'm new to *mm but I think the return value of Glib::KeyFile::load_from_file will never be false.

I may have forgotten a case but exceptions are thrown if:
- File access is denied.
- File is accessible but not a valid KeyFile.

In both cases the return value will not be written and stay what it was before even if catching the exception.

Reference: http://library.gnome.org/devel/glibmm/stable/classGlib_1_1KeyFile.html#a8e5a625d648c0e84b0bf4a8cbf6d68cc

Greetings, Rob