Dump: get stat from a wrong metadata file when restoring metadata

Dump: get stat from a wrong metadata file when restoring metadata

The dumped metadata files are shown as below
localhost:~ # ll -ih test/
total 16K
34565564 -rw-r--r-- 2 root root 1.0G Dec 14 21:15
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-3
34565563 -rw-r--r-- 2 root root 1.0G Dec 14 21:15
scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-4
34565563 -rw-r--r-- 2 root root 1.0G Dec 14 21:15 sda
34565564 -rw-r--r-- 2 root root 1.0G Dec 14 21:15 sdb

It reports such error when trying to restore metadata for /dev/sda
localhost:~ # mdadm --restore=test /dev/sda
mdadm: test/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-4 is not the same
size as /dev/sda - cannot restore.
It's because the stb value has been changed to other metadata file in
the while statement.

Signed-off-by: Lidong Zhong <lidong.zhong@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>