Always set unit number to -1 unless some other unit is specified in

the config file.  This fixes the breakage caused by the recent change
in the behavior of device_add_child for ata (which shows soren's
reservations were well founded).

Submitted by:	OGAWA Takaya <t-ogawa@triaez.kaisei.org>

usr.sbin/pccard/pccardd/file.c

@@ -573,6 +573,7 @@ new_driver(char *name)
 	drivers = drvp;
 	drvp->name = newstr(name);
 	drvp->kernel = newstr(name);
+	drvp->unit = -1;
 	p = drvp->kernel;
 	while (*p++)
 		if (*p >= '0' && *p <= '9') {