spi/dw_spi: add a missed dw_spi_remove_host() in exit sequence

Signed-off-by: NFeng Tang <feng.tang@intel.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/spi/dw_spi_pci.c

@@ -98,6 +98,7 @@ static void __devexit spi_pci_remove(struct pci_dev *pdev)
 	struct dw_spi_pci *dwpci = pci_get_drvdata(pdev);
 
 	pci_set_drvdata(pdev, NULL);
+	dw_spi_remove_host(&dwpci->dws);
 	iounmap(dwpci->dws.regs);
 	pci_release_region(pdev, 0);
 	kfree(dwpci);