fmcomms1: Fix calibration

Glade unfortunately removed actions required for the calibration dialog to
work, add them back.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
find_setup_check_fct_by_devname(): Fix crash in test mode

In test mode without any real devices dev_name will be NULL, check for this.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>