mkfs: fix zone capacity check for sequential zones

mkfs: fix zone capacity check for sequential zones

Sequential zones can have a different, smaller capacity than
conventional zones.

Currently mkfs assumes both sequential and conventional zones will have
the same capacity and and set the zone_info to the capacity of the first
found zone and use that value to validate all the remaining zones's
capacity.

Because conventional zones can't have a different capacity than its
size, the first zone always have the largest possible capacity, so, mkfs
will fail to validate any consecutive sequential zone if its capacity is
smaller than the conventional zones.

What we should do instead, is set the zone info capacity accordingly to
the settings of first zone found of the respective type and validate
the capacity based on that instead of assuming all zones will have the
same capacity.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Hans Holmberg <hans.holmberg@wdc.com>