power: supply: core: Initialize struct to zero

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071846
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
 support in the kernel for NXP i.MX8 platforms.  This set updates the
 power subsystem.  This set has been tested via simple boot tests and
 the CI loop.

commit e56a4be
Author: Linus Walleij <linus.walleij@linaro.org>
Date:   Mon Apr 25 00:13:01 2022 +0200

    power: supply: core: Initialize struct to zero

    As we rely on pointers in the battery info to be zero-initialized
    such as in the helper function power_supply_supports_vbat2ri()
    we certainly need to allocate the struct power_supply_battery_info
    with kzalloc() as well. Else this happens:

    Unable to handle kernel paging request at virtual address 00280000
    (...)
    PC is at power_supply_vbat2ri+0x50/0x12c
    LR is at ab8500_fg_battery_resistance+0x34/0x108

    Fixes: e9e7d16 ("power: supply: Support VBAT-to-Ri lookup tables")
    Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
    Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
    (cherry picked from commit e56a4be)

Signed-off-by: Al Stone <ahs3@redhat.com>

Author: Al Stone

drivers/power/supply/power_supply_core.c

@@ -616,7 +616,7 @@ int power_supply_get_battery_info(struct power_supply *psy,
 		goto out_put_node;
 	}
 
-	info = devm_kmalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
+	info = devm_kzalloc(&psy->dev, sizeof(*info), GFP_KERNEL);
 	if (!info) {
 		err = -ENOMEM;
 		goto out_put_node;