Staging: rtl8192e: adjust error handling

This patch removes a test in error handling code by adding a return
path.

The Coccinelle semantic match that found the problem is:

// <smpl>
@@
expression E,E1,E2;
@@

E = alloc_etherdev(...)
... when != E = E1
if (...) { ... free_netdev(E); ... return ...; }
... when != E = E2
(
  if (...)
   {
   ... when != free_netdev(E);
   return dev; }
|
* if (...)
   {
   ... when != free_netdev(E);
   return ...; }
|
register_netdev(E)
)

// </smpl>
Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtllib_module.c

@@ -111,7 +111,7 @@ struct net_device *alloc_rtllib(int sizeof_priv)
 	dev = alloc_etherdev(sizeof(struct rtllib_device) + sizeof_priv);
 	if (!dev) {
 		RTLLIB_ERROR("Unable to network device.\n");
-		goto failed;
+		return NULL;
 	}
 	ieee = (struct rtllib_device *)netdev_priv_rsl(dev);
 	memset(ieee, 0, sizeof(struct rtllib_device)+sizeof_priv);
@@ -180,8 +180,7 @@ struct net_device *alloc_rtllib(int sizeof_priv)
 	return dev;
 
  failed:
-	if (dev)
-		free_netdev(dev);
+	free_netdev(dev);
 	return NULL;
 }
 EXPORT_SYMBOL(alloc_rtllib);