...that were apparently meant to flag cases where conversion from old tools
strings to rtl strings was done wrongly.  But that flagging is probably of no
use: SAL_INFOs are usually disabled, so won't be noticed; and SAL_WARN or assert
would not be acceptable, as cases like 'nLen == 0x0FFFF' can legitimately
happen with long strings.  I did a successful 'make check' with these SAL_INFOs
temporarily turned into assert, so there seems to be at least no gross
conversion error remaining.

Change-Id: I57f11db9119fb12555e3bfef17c077ee5eef3844