[amunger] 18639: One liner from Alex_Ionescu that fixes svn hanging during checkout or update.

One liner from Alex_Ionescu that fixes svn hanging during checkout or
update.
Modified: trunk/reactos/lib/advapi32/sec/misc.c
  _____

Modified: trunk/reactos/lib/advapi32/sec/misc.c
--- trunk/reactos/lib/advapi32/sec/misc.c	2005-10-20 16:49:00 UTC
(rev 18638)
+++ trunk/reactos/lib/advapi32/sec/misc.c	2005-10-20 17:48:19 UTC
(rev 18639)
@@ -1203,7 +1203,7 @@

ppsidOwner = NULL;
         }
         if ((SecurityInfo & GROUP_SECURITY_INFORMATION) &&
-            *ppsidGroup != NULL)
+           (ppsidGroup) && (*ppsidGroup)) 
         {
             *ppsidGroup = NULL;
         }