Staging: vt6656: Fix unnecessary 'out of memory' message

This patch fixes one of the warnings as noted by checkpatch.pl related
to unnecessary 'out of memory' message.

This patch fixes the following checkpatch.pl error:

WARNING: Possible unnecessary 'out of memory' message

Signed-off-by: Sumit Pundir <pundirsumit11@gmail.com>

drivers/staging/vt6656/main_usb.c

@@ -427,11 +427,8 @@ static bool vnt_alloc_bufs(struct vnt_private *priv)
 
 	for (ii = 0; ii < priv->num_rcb; ii++) {
 		priv->rcb[ii] = kzalloc(sizeof(*priv->rcb[ii]), GFP_KERNEL);
-		if (!priv->rcb[ii]) {
-			dev_err(&priv->usb->dev,
-				"failed to allocate rcb no %d\n", ii);
+		if (!priv->rcb[ii])
 			goto free_rx_tx;
-		}
 
 		rcb = priv->rcb[ii];