fs/cifs/netmisc.c: convert printk to pr_foo()

Also fixes array checkpatch warning and converts it to static const
(suggested by Joe Perches).

Cc: Joe Perches <joe@perches.com>
Cc: Steve French <sfrench@samba.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Signed-off-by: Steve French <smfrench@gmail.com>