fix broken ShareAccess set/update. makes 80+ wine regtests pass

reactos/drivers/fs/vfat

diff -u -r1.76 -r1.77
--- create.c	5 Dec 2004 16:31:50 -0000	1.76
+++ create.c	6 Dec 2004 00:26:47 -0000	1.77
@@ -16,7 +16,7 @@

  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */

-/* $Id: create.c,v 1.76 2004/12/05 16:31:50 gvg Exp $

+/* $Id: create.c,v 1.77 2004/12/06 00:26:47 gdalsnes Exp $

  *
  * PROJECT:          ReactOS kernel
  * FILE:             drivers/fs/vfat/create.c

@@ -731,12 +731,24 @@

 	}
     }
 

-  pFcb->OpenHandleCount++;
-  IoSetShareAccess(Stack->Parameters.Create.SecurityContext->DesiredAccess,

+  if (pFcb->OpenHandleCount == 0)
+  {
+      IoSetShareAccess(Stack->Parameters.Create.SecurityContext->DesiredAccess,

                    Stack->Parameters.Create.ShareAccess,
                    FileObject,
                    &pFcb->FCBShareAccess);

+   }
+   else
+   {
+      IoUpdateShareAccess(
+          FileObject,
+          &pFcb->FCBShareAccess
+         );
+      
+   }

+  pFcb->OpenHandleCount++;
+  

   /* FIXME : test write access if requested */
 
   return(Status);