cxgb4: Fix typo in string

Remove the repeated ',' from string
Signed-off-by: Li kunyu <kunyu@nfschina.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb4/cxgb4_dcb.c

@@ -85,7 +85,7 @@ static void cxgb4_dcb_cleanup_apps(struct net_device *dev)
 
 		if (err) {
 			dev_err(adap->pdev_dev,
-				"Failed DCB Clear %s Application Priority: sel=%d, prot=%d, , err=%d\n",
+				"Failed DCB Clear %s Application Priority: sel=%d, prot=%d, err=%d\n",
 				dcb_ver_array[dcb->dcb_version], app.selector,
 				app.protocol, -err);
 			break;