staging: comedi: addi-data: remove unused parameters from i_pci_card_data()

The pci_bus, pci_slot, and pci_func data returned by i_pci_card_data()
are not used. Remove them from the parameters to the function and also
remove the local variables in i_ADDI_Attach() that held the returned
data.

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