tile PCI DMA: fix bug in non-page-aligned accessors

The code incorrectly masked with PAGE_OFFSET instead of
PAGE_SIZE-1. This only matters when trying to do a
non page-aligned DMA; it was noticed during code inspection.

Signed-off-by: Chris Metcalf <[e-mail]>

arch/tile/kernel/pci-dma.c

···
 	BUG_ON(!valid_dma_direction(direction));
 
 	__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
-			    dma_address & PAGE_OFFSET, size, direction);
+			    dma_address & (PAGE_SIZE - 1), size, direction);
 }
 
 static void tile_dma_sync_single_for_cpu(struct device *dev,
···
 	dma_address -= get_dma_offset(dev);
 
 	__dma_complete_page(pfn_to_page(PFN_DOWN(dma_address)),
-			    dma_address & PAGE_OFFSET, size, direction);
+			    dma_address & (PAGE_SIZE - 1), size, direction);
 }
 
 static void tile_pci_dma_sync_single_for_cpu(struct device *dev,