dbg() is a usb-serial specific macro.  This patch converts
the symbolserial.c driver to use dev_dbg() instead to tie into the
dynamic debug infrastructure.
CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Johan Hovold <jhovold@gmail.com>
CC: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
CC: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
        case -ENOENT:
        case -ESHUTDOWN:
                /* this urb is terminated, clean up */
-               dbg("%s - urb shutting down with status: %d",
-                   __func__, status);
+               dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
+                       __func__, status);
                return;
        default:
-               dbg("%s - nonzero urb status received: %d",
-                   __func__, status);
+               dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
+                       __func__, status);
                goto exit;
        }