With the sync from Dragonfly BSD in r318216 a bug slipped in (also still present
upstream it seems).

The tlv variable was changed to a pointer but the advancement of the data pointer
was left as sizeof(tlv). While the sizeof the (now) pointer equals the
sizeof 2 x uint32_t (size of the struct) on 64bit platforms, on 32bit platforms
the size of the advancement of the data pointer was wrong leading to
firmware load issues.

Correctly advance the data pointer by the size of the structure and not by
the size of a pointer.

PR: 219683
Submitted by: waddlesplash gamil.com (Haiku) on irc
MFC after: 1 week