usb: musb: print an error message when hwep alloc failed

Print an error message with qh maxpacket size and hb_mult when hwep
allocation failed, so we have a better idea why it is failed.
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/musb/musb_host.c

@@ -2152,6 +2152,10 @@ static int musb_schedule(
 				(USB_SPEED_HIGH == qh->dev->speed) ? 8 : 4;
 		goto success;
 	} else if (best_end < 0) {
+		dev_err(musb->controller,
+				"%s hwep alloc failed for %dx%d\n",
+				musb_ep_xfertype_string(qh->type),
+				qh->hb_mult, qh->maxpacket);
 		return -ENOSPC;
 	}