usx2y: don't bother with access_ok() in ->dsp_load()

memdup_user() checks it, so the only effect would be failing with
-EINVAL instead of -EFAULT in case when access_ok() is false.
However, the caller has already checked access_ok() itself (and
would have buggered off with -EFAULT), so the check is completely
pointless.  Removing it both simplifies the only instance
of ->dsp_load() and allows to get rid of the check in caller -
its sole effect used to be in preventing a bogus error value
from access_ok() in the instance.  Let memdup_user() do the
right thing instead...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

sound/usb/usx2y/usX2Yhwdep.c

@@ -198,24 +198,22 @@ static int snd_usX2Y_hwdep_dsp_load(struct snd_hwdep *hw,
 				    struct snd_hwdep_dsp_image *dsp)
 {
 	struct usX2Ydev *priv = hw->private_data;
-	int	lret, err = -EINVAL;
+	struct usb_device* dev = priv->dev;
+	int lret, err;
+	char *buf;
+
 	snd_printdd( "dsp_load %s\n", dsp->name);
 
-	if (access_ok(VERIFY_READ, dsp->image, dsp->length)) {
+	buf = memdup_user(dsp->image, dsp->length);
-		struct usb_device* dev = priv->dev;
+	if (IS_ERR(buf))
-		char *buf;
+		return PTR_ERR(buf);
 
-		buf = memdup_user(dsp->image, dsp->length);
+	err = usb_set_interface(dev, 0, 1);
-		if (IS_ERR(buf))
+	if (err)
-			return PTR_ERR(buf);
+		snd_printk(KERN_ERR "usb_set_interface error \n");
-
+	else
-		err = usb_set_interface(dev, 0, 1);
+		err = usb_bulk_msg(dev, usb_sndbulkpipe(dev, 2), buf, dsp->length, &lret, 6000);
-		if (err)
+	kfree(buf);
-			snd_printk(KERN_ERR "usb_set_interface error \n");
-		else
-			err = usb_bulk_msg(dev, usb_sndbulkpipe(dev, 2), buf, dsp->length, &lret, 6000);
-		kfree(buf);
-	}
 	if (err)
 		return err;
 	if (dsp->index == 1) {