USB: speedtch.c: remove dbg() usage

dbg() was a very old USB-specific macro that should no longer
be used. This patch removes it from being used in the driver
and uses dev_dbg() instead.

CC: Duncan Sands <duncan.sands@free.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/atm/speedtch.c

@@ -170,7 +170,7 @@ static void speedtch_set_swbuff(struct speedtch_instance_data *instance, int sta
 			 "%sabling SW buffering: usb_control_msg returned %d\n",
 			 state ? "En" : "Dis", ret);
 	else
-		dbg("speedtch_set_swbuff: %sbled SW buffering", state ? "En" : "Dis");
+		usb_dbg(usbatm, "speedtch_set_swbuff: %sbled SW buffering\n", state ? "En" : "Dis");
 }
 
 static void speedtch_test_sequence(struct speedtch_instance_data *instance)