moveoff.comp: bugfix: misuse of NCHANNELS in subs

fixes bug that appeared testing lucid

now tested:
    OK    u51   ubuntu 12.10 quantal 3.5.0-19-generic     (uspace)
    OK    shop2 debian 7.6   wheezy  3.2.0-4-rt-686-pae   (uspace)
    OK    shop2 debian 7.6   wheezy  3.4-9-rtai-686-pae   (rtai)
    OK    shop1 ubuntu 10.04 lucid   rtai 2.6.32-122-rtai (rtai)

also: remove some debugging stuff
also: improve message for closing moveoff_gui

Signed-off-by: Dewey Garrett <dgarrett@panix.com>