[media] pwc: Use kmemdup rather than duplicating its implementation

---
 drivers/media/video/pwc/pwc-ctrl.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
 
diff --git a/drivers/media/video/pwc/pwc-ctrl.c b/drivers/media/video/pwc/pwc-ctrl.c
index 3977add..b42c239 100644
--- a/drivers/media/video/pwc/pwc-ctrl.c
+++ b/drivers/media/video/pwc/pwc-ctrl.c
@@ -113,10 +113,9 @@ static int _send_control_msg(struct pwc_device *pdev,
 	void *kbuf = NULL;
 
 	if (buflen) {
-		kbuf = kmalloc(buflen, GFP_KERNEL); /* not allowed on stack */
+		kbuf = kmemdup(buf, buflen, GFP_KERNEL); /* not allowed on stack */
 		if (kbuf == NULL)
 			return -ENOMEM;
-		memcpy(kbuf, buf, buflen);
 	}
 
 	rc = usb_control_msg(pdev->udev, usb_sndctrlpipe(pdev->udev, 0),