This can only happen if partition is partly out-of-frame, in which
case the referenced mv is either out-of-frame also (and thus has the
same value as an already-read one), or it is actually uninitialized,
in which case we don't want to use it.

Change-Id: Icf39fa4d987c7abcbebb9bbdcdd6311e8fb9d3c9