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>
diff --git a/disk/part_iso.c b/disk/part_iso.c
index 9f5c50c..f9a741d 100644
--- a/disk/part_iso.c
+++ b/disk/part_iso.c
@@ -233,13 +233,13 @@
 	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);