Staging: vt6656: Adjust comments in bssdb.c

Changes C99-style comments to C89-style ones to conform to the linux
coding guidelines. Additionally removes plus and minus signs from the
function description comments.
Signed-off-by: NSebastian Rachuj <sebastian.rachuj@studium.uni-erlangen.de>
Signed-off-by: NSimon Schuster <linux@rationality.eu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>