libata: trim trailing whitespace.

Also, fixup a tabs-to-spaces block of code in ata_piix.
diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index c5e09dc..cb3a6d8 100644
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -342,7 +342,7 @@
 
 	pci_set_master(pdev);
 
-	/* 
+	/*
 	 * Config offset 0x98 is "Extended Control and Status Register 0"
 	 * Default value is (1 << 28).  All bits except bit 28 are reserved in
 	 * DPA mode.  If bit 28 is set, LED 0 reflects all ports' activity.