usb: dwc3: gadget: pass a condition to dev_WARN_ONCE()

instead of using:

	if (condition) {
		dev_WARN_ONCE(dev, true, "foo");
		return -EINVAL;
	}

let's use:

	if (dev_WARN_ONCE(dev, condition, "foo"))
		return -EINVAL;
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/gadget.c

@@ -661,11 +661,10 @@ static int dwc3_gadget_ep_enable(struct usb_ep *ep,
 	dep = to_dwc3_ep(ep);
 	dwc = dep->dwc;
 
-	if (dep->flags & DWC3_EP_ENABLED) {
-		dev_WARN_ONCE(dwc->dev, true, "%s is already enabled\n",
-				dep->name);
+	if (dev_WARN_ONCE(dwc->dev, dep->flags & DWC3_EP_ENABLED,
+					"%s is already enabled\n",
+					dep->name))
 		return 0;
-	}
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	ret = __dwc3_gadget_ep_enable(dep, desc, ep->comp_desc, false, false);
@@ -689,11 +688,10 @@ static int dwc3_gadget_ep_disable(struct usb_ep *ep)
 	dep = to_dwc3_ep(ep);
 	dwc = dep->dwc;
 
-	if (!(dep->flags & DWC3_EP_ENABLED)) {
-		dev_WARN_ONCE(dwc->dev, true, "%s is already disabled\n",
-				dep->name);
+	if (dev_WARN_ONCE(dwc->dev, !(dep->flags & DWC3_EP_ENABLED),
+					"%s is already disabled\n",
+					dep->name))
 		return 0;
-	}
 
 	spin_lock_irqsave(&dwc->lock, flags);
 	ret = __dwc3_gadget_ep_disable(dep);