need policy on signed vs unsigned unit allocations

[jhoblitt]

We need to define a policy that forbids the following.

--
psBitSet* psBitSetAlloc(psS32 n)
{

psS32 numBytes = 0;
psBitSet* newObj = NULL;

if (n < 0) {

psError(PS_ERR_BAD_PARAMETER_VALUE, true,

PS_ERRORTEXT_psBitSet_ALLOC_NEG_SIZE,
n);

return NULL;

}

.
.
--

I've changed the prototype in the SDRS to be unsigned but haven't added any
discussion about this issue as I believe we should do it 'globally' for the SDRS.

[Paul Price]

See the SDRS section "Negative allocations".