usb: gadget: function: Simplify diagnostic messaging in printer

Don't issue messages which can be easily achieved with ftrace.
In case of printer_open() the return code is propagated to other layers
so the user will know about -EBUSY anyway.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Link: https://lore.kernel.org/r/20221123110746.59611-1-andrzej.p@collabora.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/function/f_printer.c

@@ -364,7 +364,7 @@ printer_open(struct inode *inode, struct file *fd)
 	spin_unlock_irqrestore(&dev->lock, flags);
 
 	kref_get(&dev->kref);
-	DBG(dev, "printer_open returned %x\n", ret);
+
 	return ret;
 }
 
@@ -382,7 +382,6 @@ printer_close(struct inode *inode, struct file *fd)
 	spin_unlock_irqrestore(&dev->lock, flags);
 
 	kref_put(&dev->kref, printer_dev_free);
-	DBG(dev, "printer_close\n");
 
 	return 0;
 }
@@ -848,8 +847,6 @@ static void printer_reset_interface(struct printer_dev *dev)
 	if (dev->interface < 0)
 		return;
 
-	DBG(dev, "%s\n", __func__);
-
 	if (dev->in_ep->desc)
 		usb_ep_disable(dev->in_ep);
 
@@ -887,8 +884,6 @@ static void printer_soft_reset(struct printer_dev *dev)
 {
 	struct usb_request	*req;
 
-	INFO(dev, "Received Printer Reset Request\n");
-
 	if (usb_ep_disable(dev->in_ep))
 		DBG(dev, "Failed to disable USB in_ep\n");
 	if (usb_ep_disable(dev->out_ep))
@@ -1185,8 +1180,6 @@ static void printer_func_disable(struct usb_function *f)
 {
 	struct printer_dev *dev = func_to_printer(f);
 
-	DBG(dev, "%s\n", __func__);
-
 	printer_reset_interface(dev);
 }