drivers/net/wireless/hostap: Drop memory allocation cast

Drop cast on the result of kmalloc and similar functions.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
type T;
@@

- (T *)
  (\(kmalloc\|kzalloc\|kcalloc\|kmem_cache_alloc\|kmem_cache_zalloc\|
   kmem_cache_alloc_node\|kmalloc_node\|kzalloc_node\)(...))
// </smpl>

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

drivers/net/wireless/hostap/hostap_ioctl.c

@@ -3038,8 +3038,7 @@ static int prism2_ioctl_priv_download(local_info_t *local, struct iw_point *p)
 	    p->length > 1024 || !p->pointer)
 		return -EINVAL;
 
-	param = (struct prism2_download_param *)
-		kmalloc(p->length, GFP_KERNEL);
+	param = kmalloc(p->length, GFP_KERNEL);
 	if (param == NULL)
 		return -ENOMEM;