xilinx_spips: Set unused IRQs to NULL

Unused CS lines should init to 0 to avoid segfaulting when accessing an
unattached QSPI controller.
Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: c1e45198032106e69e8fe9339fc2e6348d524fcd.1362373359.git.peter.crosthwaite@xilinx.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/xilinx_spips.c

@@ -497,7 +497,7 @@ static int xilinx_spips_init(SysBusDevice *dev)
         s->spi[i] = ssi_create_bus(&dev->qdev, bus_name);
     }
 
-    s->cs_lines = g_new(qemu_irq, s->num_cs * s->num_busses);
+    s->cs_lines = g_new0(qemu_irq, s->num_cs * s->num_busses);
     ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi[0]);
     ssi_auto_connect_slaves(DEVICE(s), s->cs_lines, s->spi[1]);
     sysbus_init_irq(dev, &s->irq);