printk: Add printk_once
This is needed by upcoming list_sort implementation.

Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
1 parent eb36388 commit 97cef9084335959ad2e9d088d6d8adadf6c6e861
@Alexander Stein Alexander Stein authored on 17 Mar 2016
Sascha Hauer committed on 8 Apr 2016
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include/printk.h