staging: comedi: amplc_dio200_pci: use pci_ioremap_bar()

Use `pci_ioremap_bar()` to ioremap the PCI memory resources.  That
function just takes the PCI device and a bar index.  It also has some
additional sanity checks to make sure the bar is actually a memory
resource.

Eliminate some local variables from `dio200_pcie_board_setup()` and
`dio200_pci_auto_attach()` that were used to hold the results of
`pci_resource_len()` and `pci_resource_start()` that were only used
once.  Also eliminate the check that the bar is a memory resource in
`dio200_pcie_board_setup()` as `pci_ioremap_bar()` will do that for us.

Signed-off-by: Ian Abbott <[email protected]>
Reviewed-by: H Hartley Sweeten <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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