staging: comedi: hwdrv_apci1500: clean some whitespace style issues

Now that commented out code has been removed, else statements can move to
the same line as the close brace of the if statement.  Also, a blank line
has been added between declarations and code where needed.

Signed-off-by: Chase Southwood <chase.southwood@gmail.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Cc: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>