lantiq: ltq-ptm: fix ADSL showtime handler

commit 2d6c7c2526 introduced a reference to g_xdata_addr which isn't
defined in that context. Use xdata_addr here instead.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

package/kernel/lantiq/ltq-ptm/src/ifxmips_ptm_adsl.c

@@ -1519,7 +1519,7 @@ static int ifx_ptm_init(void)
     port_cell.port_num = 1;
     ifx_mei_atm_showtime_check(&g_showtime, &port_cell, &xdata_addr);
     if ( g_showtime ) {
-	ptm_showtime_enter(&port_cell, &g_xdata_addr);
+	ptm_showtime_enter(&port_cell, &xdata_addr);
     }
 
     ifx_mei_atm_showtime_enter = ptm_showtime_enter;