md: Handle growth of v1.x metadata correctly.

md: Handle growth of v1.x metadata correctly.

commit 70471dafe3390243c598a3165dfb86b8b8b3f4fe upstream.

The v1.x metadata does not have a fixed size and can grow
when devices are added.
If it grows enough to require an extra sector of storage,
we need to update the 'sb_size' to match.

Without this, md can write out an incomplete superblock with a
bad checksum, which will be rejected when trying to re-assemble
the array.

Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>