[VLAN]: Clean up debugging and printks

- use pr_* functions and common prefix for non-device related messages

- remove VLAN_ printk levels

- kill lots of useless debugging statements

- remove a few unnecessary printks like for double VID registration (already
  returns -EEXIST) and kill of a number of unnecessary checks in
  vlan_proc_{add,rem}_dev() that are already performed by the caller

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/8021q/vlan.h

@@ -3,31 +3,6 @@
 
 #include <linux/if_vlan.h>
 
-/*  Uncomment this if you want debug traces to be shown. */
-/* #define VLAN_DEBUG */
-
-#define VLAN_ERR KERN_ERR
-#define VLAN_INF KERN_INFO
-#define VLAN_DBG KERN_ALERT /* change these... to debug, having a hard time
-			     * changing the log level at run-time..for some reason.
-			     */
-
-/*
-
-These I use for memory debugging.  I feared a leak at one time, but
-I never found it..and the problem seems to have dissappeared.  Still,
-I'll bet they might prove useful again... --Ben
-
-
-#define VLAN_MEM_DBG(x, y, z) printk(VLAN_DBG "%s:  "  x, __FUNCTION__, y, z);
-#define VLAN_FMEM_DBG(x, y) printk(VLAN_DBG "%s:  " x, __FUNCTION__, y);
-*/
-
-/* This way they don't do anything! */
-#define VLAN_MEM_DBG(x, y, z)
-#define VLAN_FMEM_DBG(x, y)
-
-
 extern unsigned short vlan_name_type;
 
 #define VLAN_GRP_HASH_SHIFT	5