Before reading an ascii label, initialize with defaults so that

getasciipartspec() has a sectorisize in case it needs one.

Approved by:	re/jhb

sbin/bsdlabel/bsdlabel.c

@@ -656,6 +656,7 @@ getasciilabel(FILE *f, struct disklabel *lp)
 	int lineno = 0, errors = 0;
 	int i;
 
+	makelabel("auto", lp);
 	bzero(&part_set, sizeof(part_set));
 	bzero(&part_size_type, sizeof(part_size_type));
 	bzero(&part_offset_type, sizeof(part_offset_type));