ata: libata: Change ata_dev_knobble() to return a bool

Change the function ata_dev_knobble() to return a boolean instead of a
u8.
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Igor Pylypiv <ipylypiv@google.com>
Reviewed-by: Niklas Cassel <cassel@kernel.org>

drivers/ata/libata-core.c

@@ -2219,12 +2219,12 @@ static int ata_do_link_spd_horkage(struct ata_device *dev)
 	return 0;
 }
 
-static inline u8 ata_dev_knobble(struct ata_device *dev)
+static inline bool ata_dev_knobble(struct ata_device *dev)
 {
 	struct ata_port *ap = dev->link->ap;
 
 	if (ata_dev_blacklisted(dev) & ATA_HORKAGE_BRIDGE_OK)
-		return 0;
+		return false;
 
 	return ((ap->cbl == ATA_CBL_SATA) && (!ata_id_is_sata(dev->id)));
 }