usb: dwc3: gadget: fix XferNotReady debug print

Only bit 3 of the event status bitfield is valid
and the others should not be considered.

Make sure SW matches documentation on that case
to avoid bogus debugging prints which would
confuse an engineer.

Signed-off-by: Felipe Balbi <balbi@ti.com>
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index e0e2337..4b64dc0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1657,7 +1657,8 @@
 			int ret;
 
 			dev_vdbg(dwc->dev, "%s: reason %s\n",
-					dep->name, event->status
+					dep->name, event->status &
+					DEPEVT_STATUS_TRANSFER_ACTIVE
 					? "Transfer Active"
 					: "Transfer Not Active");