The previous patch did not compile cleanly on all architectures so
here's a fixed one.
Use the DMA_32BIT_MASK constant from dma-mapping.h when calling
pci_set_dma_mask() or pci_set_consistent_dma_mask()
Signed-off-by: Tobias Klauser <tklauser@nuerscht.ch>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>