Don't crash if ShellFolder doesn't implement the IID_ISFHelper interface.

Modified: trunk/reactos/lib/shell32/shlview.c

--- trunk/reactos/lib/shell32/shlview.c	2005-01-03 20:43:23 UTC (rev 12762)
+++ trunk/reactos/lib/shell32/shlview.c	2005-01-03 21:19:25 UTC (rev 12763)
@@ -1456,6 +1456,9 @@

 		IShellFolder_QueryInterface(This->pSFParent, &IID_ISFHelper,
 		 	(LPVOID*)&psfhlp);
 

+		if (psfhlp == NULL)
+		  break;
+

 		if(!(i = ListView_GetSelectedCount(This->hWndList)))
 		  break;