- Set Buf to NULL so we don't try to free it again later

svn path=/branches/aicom-network-fixes/; revision=35306

drivers/network/afd/afd/lock.c

@@ -123,6 +123,7 @@ VOID UnlockBuffers( PAFD_WSABUF Buf, UINT Count, BOOL Address ) {
     }
 
     ExFreePool( Buf );
+    Buf = NULL;
 }
 
 /* Produce a kernel-land handle array with handles replaced by object