staging: comedi: adv_pci_dio: remove whitespace

Fixed checkpatch.pl warning:

CHECK: Blank lines aren't necessary before a close brace '}'
+
+               }

Signed-off-by: Mikko Talikka <mikko.talikka@live.com>
Link: https://lore.kernel.org/r/AM0PR01MB42597C4CAA1B9E51D4AE3D5E974F9@AM0PR01MB4259.eurprd01.prod.exchangelabs.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>