gfs2: Fix inode height consistency check

The maximum allowed height of an inode's metadata tree depends on the
filesystem block size; it is lower for bigger-block filesystems.  When
reading in an inode, make sure that the height doesn't exceed the
maximum allowed height.

Arrays like sd_heightsize are sized to be big enough for any filesystem
block size; they will often be slightly bigger than what's needed for a
specific filesystem.

Reported-by:  <syzbot+45d4691b1ed3c48eba05@syzkaller.appspotmail.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>