windows-winqual-20060206

windows-winqual-20060206

Fix two bugs reported via Windows Crash Reporting:

 * Freelance initialization is somehow broken allowing the number of
   locally defined mountpoints to become negative.  Due to the use of
   != instead of < in loops, it is possible to read/write unallocated
   memory.

 * GetTextualSid() was not properly handling a NULL output buffer
   pointer as an indication that the desired size should be returned.