[libata] trim trailing whitespace

Most of these contributed by that mysterious figger known as A.C.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/ata/sata_sis.c b/drivers/ata/sata_sis.c
index c1e3219..c90fb13 100644
--- a/drivers/ata/sata_sis.c
+++ b/drivers/ata/sata_sis.c
@@ -311,7 +311,7 @@
 			pi.flags |= ATA_FLAG_SLAVE_POSS;
 		}
 		break;
-	
+
 	case 0x0182:
 	case 0x0183:
 		pci_read_config_dword ( pdev, 0x6C, &val);