don't call ped_partition_new with "0" as 2nd arg

don't call ped_partition_new with "0" as 2nd arg

Instead, use an explicit and equivalent PED_PARTITION_NORMAL.
* libparted/labels/bsd.c (bsd_read):
* libparted/labels/dasd.c (dasd_read):
* libparted/labels/gpt.c (_parse_part_entry):
* libparted/labels/loop.c (loop_read):
* libparted/labels/mac.c (_disk_add_part_map_entry)
(_rawpart_analyse):
* libparted/labels/pc98.c (read_table):
* libparted/labels/rdb.c (amiga_read):
* libparted/labels/sun.c (sun_read):