mfd: sta2x11: Build warning fix

This driver cannot be a module, so "remove" is never called. The
mishap is mine, and back then there was no warning due to __devexit().

Signed-off-by: Alessandro Rubini <[e-mail]>
Acked-by: Giancarlo Asnaghi <[e-mail]>
Acked-by: Davide Ciminaghi <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/mfd/sta2x11-mfd.c

···
 	return 0;
 }
 
-static int mfd_remove(struct pci_dev *pdev)
-{
-	struct sta2x11_mfd *mfd = sta2x11_mfd_find(pdev);
-
-	if (!mfd)
-		return -ENODEV;
-	list_del(&mfd->list);
-	kfree(mfd);
-	return 0;
-}
-
 /* This function is exported and is not expected to fail */
 u32 __sta2x11_mfd_mask(struct pci_dev *pdev, u32 reg, u32 mask, u32 val,
 		       enum sta2x11_mfd_plat_dev index)