libata: Fix ata_err_string()

Add proper error string output for ATA_ERR_NCQ and ATA_ERR_NODEV_HINT
instead of returning "unknown error".
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

drivers/ata/libata-eh.c

@@ -1483,6 +1483,10 @@ static const char *ata_err_string(unsigned int err_mask)
 		return "invalid argument";
 	if (err_mask & AC_ERR_DEV)
 		return "device error";
+	if (err_mask & AC_ERR_NCQ)
+		return "NCQ error";
+	if (err_mask & AC_ERR_NODEV_HINT)
+		return "Polling detection error";
 	return "unknown error";
 }