Staging: comedi: addi-data: cleanup brace usage in hwdrv_apci1564.c

hwdrv_apci1564.c had many single statments wrapped in braces, so we can
delete these.  Also, some else statements were improperly placed, fix
these too.

Signed-off-by: Chase Southwood <chase.southwood@yahoo.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>