libata: trim trailing whitespace.

Also, fixup a tabs-to-spaces block of code in ata_piix.
diff --git a/drivers/scsi/sata_via.c b/drivers/scsi/sata_via.c
index f43183c..feff109 100644
--- a/drivers/scsi/sata_via.c
+++ b/drivers/scsi/sata_via.c
@@ -347,7 +347,7 @@
 		probe_ent = vt6420_init_probe_ent(pdev);
 	else
 		probe_ent = vt6421_init_probe_ent(pdev);
-	
+
 	if (!probe_ent) {
 		printk(KERN_ERR DRV_NAME "(%s): out of memory\n",
 		       pci_name(pdev));