drivers/net/wireless/orinoco: Use kmemdup

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

-  to = \(kmalloc\|kzalloc\)(size,flag);
+  to = kmemdup(from,size,flag);
   if (to==NULL || ...) S
-  memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/orinoco/wext.c

@@ -993,11 +993,9 @@ static int orinoco_ioctl_set_genie(struct net_device *dev,
 		return -EINVAL;
 
 	if (wrqu->data.length) {
-		buf = kmalloc(wrqu->data.length, GFP_KERNEL);
+		buf = kmemdup(extra, wrqu->data.length, GFP_KERNEL);
 		if (buf == NULL)
 			return -ENOMEM;
-
-		memcpy(buf, extra, wrqu->data.length);
 	} else
 		buf = NULL;