[PCMCIA] fix yenta unload oops

Patch from Daniel Ritz

rmmod yenta produces the following oops:
Unable to handle kernel paging request at virtual address d084781e
EIP is at yenta_config_init+0x18f/0x1e0 [yenta]
Process pccardd (pid: 2618, threadinfo=c3236000 task=c988ae60)

drivers/pcmcia/yenta.c

@@ -751,6 +751,9 @@ static void yenta_close(struct pci_dev *dev)
 {
 	struct yenta_socket *sock = pci_get_drvdata(dev);
 
+	/* we don't want a dying socket registered */
+	pcmcia_unregister_socket(&sock->socket);
+	
 	/* Disable all events so we don't die in an IRQ storm */
 	cb_writel(sock, CB_SOCKET_MASK, 0x0);
 	exca_writeb(sock, I365_CSCINT, 0);
@@ -764,7 +767,6 @@ static void yenta_close(struct pci_dev *dev)
 		iounmap(sock->base);
 	yenta_free_resources(sock);
 
-	pcmcia_unregister_socket(&sock->socket);
 	pci_set_drvdata(dev, NULL);
 }