ata: libata-sff: make ata_devchk() return 'bool'

ata_devchk() returns 1 if a device is present, 0 if not -- the 'bool' type
clearly fits better here than 'unsigned int'...

Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

drivers/ata/libata-sff.c

@@ -1751,10 +1751,13 @@ EXPORT_SYMBOL_GPL(ata_sff_prereset);
  *	correctly storing and echoing back the
  *	ATA shadow register contents.
  *
+ *	RETURN:
+ *	true if device is present, false if not.
+ *
  *	LOCKING:
  *	caller.
  */
-static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
+static bool ata_devchk(struct ata_port *ap, unsigned int device)
 {
 	struct ata_ioports *ioaddr = &ap->ioaddr;
 	u8 nsect, lbal;
@@ -1774,9 +1777,9 @@ static unsigned int ata_devchk(struct ata_port *ap, unsigned int device)
 	lbal = ioread8(ioaddr->lbal_addr);
 
 	if ((nsect == 0x55) && (lbal == 0xaa))
-		return 1;	/* we found a device */
+		return true;	/* we found a device */
 
-	return 0;		/* nothing found */
+	return false;		/* nothing found */
 }
 
 /**