[Bug 279684] ctld truncates LUN size to 4GiB on 32-bit platforms

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279684

            Bug ID: 279684
           Summary: ctld truncates LUN size to 4GiB on 32-bit platforms
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: asomers@FreeBSD.org

The ctld.conf file allows specifying the size of a LUN.  It's required for
ramdisk-backed LUNs, and optional for block-backed LUNs.  In traditional mode
it's parsed as a uin64_t.  In UCL mode, it's parsed as an int64_t. That's a
little bit inconsistent, but not bad.  The bad part is that it then gets
truncated by being passed to lun_set_size, which takes its argument as a usize.
 That's a bug on 32-bit platforms.

The solution is to always handle the size as a uint64_t, which is ultimately
what the kernel expects.

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