iso: Fix part info command

Partitions on the iso el torito partition table interpreter
only start from partition 1. So when printing out the tables,
let's also start counting at 1.

Signed-off-by: Alexander Graf <agraf@suse.de>

disk/part_iso.c

@@ -233,13 +233,13 @@ static void part_print_iso(struct blk_desc *dev_desc)
 	disk_partition_t info;
 	int i;
 
-	if (part_get_info_iso_verb(dev_desc, 0, &info, 0) == -1) {
+	if (part_get_info_iso_verb(dev_desc, 1, &info, 0) == -1) {
 		printf("** No boot partition found on device %d **\n",
 		       dev_desc->devnum);
 		return;
 	}
 	printf("Part   Start     Sect x Size Type\n");
-	i=0;
+	i=1;
 	do {
 		printf(" %2d " LBAFU " " LBAFU " %6ld %.32s\n",
 		       i, info.start, info.size, info.blksz, info.type);