pcmcia: fix 'driver ... did not release config properly' warning

Up to 2.6.34 pcmcia_release_irq() reset p_dev->_irq to 0 after releasing
the irq.  The IRQ is now released in pcmcia_disable_device(), however
p_dev->_irq is not reset, triggering a warning in pcmcia_device_remove().
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

drivers/pcmcia/pcmcia_resource.c

@@ -857,8 +857,10 @@ void pcmcia_disable_device(struct pcmcia_device *p_dev)
 {
 	pcmcia_release_configuration(p_dev);
 	pcmcia_release_io(p_dev, &p_dev->io);
-	if (p_dev->_irq)
+	if (p_dev->_irq) {
 		free_irq(p_dev->irq, p_dev->priv);
+		p_dev->_irq = 0;
+	}
 	if (p_dev->win)
 		pcmcia_release_window(p_dev, p_dev->win);
 }