libata: trim trailing whitespace.

Also, fixup a tabs-to-spaces block of code in ata_piix.
diff --git a/drivers/scsi/sata_uli.c b/drivers/scsi/sata_uli.c
index a71fb54..eb202a7 100644
--- a/drivers/scsi/sata_uli.c
+++ b/drivers/scsi/sata_uli.c
@@ -214,7 +214,7 @@
 		rc = -ENOMEM;
 		goto err_out_regions;
 	}
-	
+
 	switch (board_idx) {
 	case uli_5287:
 		probe_ent->port[0].scr_addr = ULI5287_BASE;