staging: wlags49_h2: fix error return code in wl_adapter_insert()

When return from wl_adapter_insert() in the register_netdev() error
handling case, 'ret' which is 0 is returned, but we should return a
negative error code instead, so fix to return the return value of
register_netdev().

Introduce by commit 657d4c86
(staging: wlags49_h2: fix error handling in pcmcia probe function)
Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wlags49_h2/wl_cs.c

@@ -259,7 +259,8 @@ int wl_adapter_insert(struct pcmcia_device *link)
 	dev->base_addr  = link->resource[0]->start;
 
 	SET_NETDEV_DEV(dev, &link->dev);
-	if (register_netdev(dev) != 0) {
+	ret = register_netdev(dev);
+	if (ret != 0) {
 		printk("%s: register_netdev() failed\n", MODULE_NAME);
 		goto failed;
 	}