linux-kernel - [power supply]:missing definition without config

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Date:   Fri, 15 Nov 2019 14:06:04 +0800
From:   fuyao <fuyao@...winnertech.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     麦键樟 <maijianzhang@...winnertech.com>,
        李静psw <lijingpsw@...winnertech.com>
Subject: [power supply]:missing definition without config

linux-pm:
hi, walk around the power_supply.h file. 
call power_supply_get_by_name without the CONFIG_POWER_SUPPLY, cause
error.
if we should use:

#ifdef CONFIG_POWER_SUPPLY
extern extern struct power_supply *power_supply_get_by_name(const char *name);
#else
static inline struct power_supply *
power_supply_get_by_name(const char *name)
{return NULL;}
#endif