From 9200025724619d83f9fc366281f0bde36afe6e5a Mon Sep 17 00:00:00 2001
From: Xunlei Pang <pang.xunlei@linaro.org>
Date: Fri, 12 Jun 2015 10:04:10 +0800
Subject: [PATCH] rtc: Introduce rtc_tm_sub() helper function

There're many sites need comparing the two rtc_time variants for many
rtc drivers, especially in the instances of rtc_class_ops::set_alarm().

So add this common helper function to make things easy.

Suggested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
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