USB: ipw.c: remove dbg() tracing calls

dbg() was used a lot a long time ago to trace code flow.  Now that we have
ftrace, this isn't needed at all, so remove these calls.

CC: Rusty Russell <rusty@rustcorp.com.au>
CC: Oliver Neukum <oneukum@suse.de>
CC: Alan Stern <stern@rowland.harvard.edu>
CC: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/ipw.c

@@ -155,8 +155,6 @@ static int ipw_open(struct tty_struct *tty, struct usb_serial_port *port)
 	u8 *buf_flow_init;
 	int result;
 
-	dbg("%s", __func__);
-
 	buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL);
 	if (!buf_flow_init)
 		return -ENOMEM;