GObject creation cannot normally fail, except for types that implement
GInitable and take a GError in their _new() method. Some NM types
override constructor() and return NULL in some cases, but these
generally only happen in the case of programmer error (eg, failing to
set a mandatory property), and so crashing is reasonable (and most
likely inevitable anyway).
So, remove all NULL checks after calls to g_object_new() and its
myriad wrappers.
https://bugzilla.gnome.org/show_bug.cgi?id=693678
The default wired connection should own a reference to the device
it's made for, but that got dropped in
78df8c49a1, which used to use a
set_property handler with g_value_dup_object() which obviously
increments the reference count. But that ref got dropped when
the object initialization was simplified.
Where 'x' is a number that's not yet used by any existing connection.
And clean up the default wired class initialization. This name is
more friendly than "Auto eth0" which was confusing to quite a few
people. This also checks to ensure there's no other connection with
the same name, which the old method did not.
Suggested by Jon McCann.
