rfcomm_cleanup_ttys() is also called from rfcomm_init(), so it can't
have __exit.
Reported-by: NMat Martineau <mathewm@codeaurora.org>
Signed-off-by: NGustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>