[libata] export ata_dev_pair; trim trailing whitespace

Mostly, trim trailing whitespace.

Also:
* export ata_dev_pair
* move ata_dev_classify export closer to ata_dev_pair export
diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index 9701a80..836bbbb 100644
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -230,11 +230,11 @@
 					handled += ata_host_intr(ap, qc);
 				} else if (is_vsc_sata_int_err(i, int_status)) {
 					/*
-					 * On some chips (i.e. Intel 31244), an error 
+					 * On some chips (i.e. Intel 31244), an error
 					 * interrupt will sneak in at initialization
 					 * time (phy state changes).  Clearing the SCR
 					 * error register is not required, but it prevents
-					 * the phy state change interrupts from recurring 
+					 * the phy state change interrupts from recurring
 					 * later.
 					 */
 					u32 err_status;