can: ems_usb: fix coding style

This patch fixes the coding style issues introduced in commit:

    90cfde46 can: ems_usb: Fix possible tx overflow
Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/usb/ems_usb.c

@@ -281,11 +281,9 @@ static void ems_usb_read_interrupt_callback(struct urb *urb)
 	switch (urb->status) {
 	case 0:
 		dev->free_slots = dev->intr_in_buffer[1];
-		if(dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH){
-			if (netif_queue_stopped(netdev)){
+		if (dev->free_slots > CPC_TX_QUEUE_TRIGGER_HIGH &&
+		    netif_queue_stopped(netdev))
 			netif_wake_queue(netdev);
-			}
-		}
 		break;
 
 	case -ECONNRESET: /* unlink */