Using DsRoleGetPrimaryDomainInformation with DsRoleFreeMemory tries to free an invalid heap address

If I use DsRoleGetPrimaryDomainInformation with DsRoleFreeMemory as intended, I'm getting the following message in the debug log:

(..\sdk\lib\rtl\heap.c:2199) HEAP: Trying to free an invalid address 0013569C!

In real-world applications (aka localspl.dll LocalGetPrinterDataEx), this later leads to a heap assertion failure.
I've committed a small API test in r75208, which triggers this problem. The API test itself succeeds, but you should also get this error on the debug log.