usb: dwc3: gadget: Change to dev_dbg() when queuing to inactive gadget/ep

Since function drivers will still be active until dwc3_disconnect_gadget() is called, some applications will continue to queue packets to DWC3 gadget. This can lead to a flood of messages regarding failed ep queue, as the endpoint is in the process of being disabled. Change the log level to debug, so that it can be enabled when debugging issues.

---
Changes from v1:
- Modified dev_err() to dev_dbg()

 drivers/usb/dwc3/gadget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 4845682a0408..0d32e97f11cd 100644
@@ -1813,7 +1813,7 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 	struct dwc3		*dwc = dep->dwc;
 
 	if (!dep->endpoint.desc || !dwc->pullups_connected || !dwc->connected) {
-		dev_err(dwc->dev, "%s: can't queue to disabled endpoint\n",
+		dev_dbg(dwc->dev, "%s: can't queue to disabled endpoint\n",
 				dep->name);
 		return -ESHUTDOWN;
 	}

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