fix r18639 the right way: don't check a - possibly random - pointer supplied by the caller, also correctly clear the owner SID pointer

Modified: trunk/reactos/lib/advapi32/sec/misc.c

--- trunk/reactos/lib/advapi32/sec/misc.c	2005-10-20 17:48:19 UTC (rev 18639)
+++ trunk/reactos/lib/advapi32/sec/misc.c	2005-10-20 17:59:00 UTC (rev 18640)
@@ -1200,10 +1200,10 @@

         if ((SecurityInfo & OWNER_SECURITY_INFORMATION) &&
             ppsidOwner != NULL)
         {

-            ppsidOwner = NULL;

+            *ppsidOwner = NULL;

         }
         if ((SecurityInfo & GROUP_SECURITY_INFORMATION) &&

-           (ppsidGroup) && (*ppsidGroup)) 

+            ppsidGroup != NULL)

         {
             *ppsidGroup = NULL;
         }