This will make it slightly easier to port mm_port_serial_at_command() to
use GTask, since we won't have to keep a pointer to the result in GTask
after _finish() has been called.
In most cases the caller needs the value anyway, so this doesn't add too
much hasle.
We are going to allow including the plugin sources built within the
ModemManager daemon binary; moving the sources within the daemon
sources directory makes it easier.
Lukas Voegl
Aleksander Morgado
Lubomir Rintel