USB: Staging: quatech_usb3: remove err() usage

err() was a very old USB-specific macro that I thought had
gone away.  This patch removes it from being used in the
driver and uses dev_err() instead

Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Kautuk Consul <consul.kautuk@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/quatech_usb2/quatech_usb2.c

@@ -541,7 +541,7 @@ int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 		dbg("port->write_urb == NULL, allocating one");
 		port->write_urb = usb_alloc_urb(0, GFP_KERNEL);
 		if (!port->write_urb) {
-			err("Allocating write URB failed");
+			dev_err(&port->dev, "Allocating write URB failed\n");
 			return -ENOMEM;
 		}
 		/* buffer same size as port0 */
@@ -549,7 +549,7 @@ int qt2_open(struct tty_struct *tty, struct usb_serial_port *port)
 		port->bulk_out_buffer = kmalloc(port->bulk_out_size,
 						GFP_KERNEL);
 		if (!port->bulk_out_buffer) {
-			err("Couldn't allocate bulk_out_buffer");
+			dev_err(&port->dev, "Couldn't allocate bulk_out_buffer\n");
 			return -ENOMEM;
 		}
 	}