[native] Bug report -cannot create a native raid on devel-3.2

Hi Neil,
Creation of a native raid fails:
mdadm -CR /dev/md/aaa -n 2 -l 1 /dev/sdb /dev/sdc
mdadm: ADD_NEW_DISK for /dev/sdb failed: Invalid argument.
In /var/log/messages:
md: sdb does not have a valid v1.2 superblock, not importing!

This on top on devel-3.2.
The bug is probably connected with fix 1cc7f4feb9a979 "Don't close fds in write_init_super".
In the call to get_dev_size from write_init_super1 the di->fd descriptor is zero and get_dev_size returns with error.
One of the first steps in load_super1 is call free_super1(st). free_super1 releases st->info pointer and closes(di->fd);

The sequence in write_init_super1:
for (di = st->info; di && ! rv ; di = di->next) {
....

1060 if (load_super1(&refst, di->fd, NULL)==0) {
1076
<..cut..>
1077 if (!get_dev_size(di->fd, NULL, &dsize))
1078 return 1;
< ...cut ... >
}

Thanks,
Marcin Labun

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