USB: gadget: 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: Greg Kroah-Hartman <gregkh@suse.de>

drivers/usb/gadget/atmel_usba_udc.c

@@ -48,10 +48,9 @@ static int queue_dbg_open(struct inode *inode, struct file *file)
 
 	spin_lock_irq(&ep->udc->lock);
 	list_for_each_entry(req, &ep->queue, queue) {
-		req_copy = kmalloc(sizeof(*req_copy), GFP_ATOMIC);
+		req_copy = kmemdup(req, sizeof(*req_copy), GFP_ATOMIC);
 		if (!req_copy)
 			goto fail;
-		memcpy(req_copy, req, sizeof(*req_copy));
 		list_add_tail(&req_copy->queue, queue_data);
 	}
 	spin_unlock_irq(&ep->udc->lock);