SDL: joystick: Fix spurious battery empty events when opening a Shield controller

SDL Commits
1 
From b321eae51a64fece5e8978edab081c4dfea422f3 Mon Sep 17 00:00:00 2001
From: Cameron Gutman <[EMAIL REDACTED]>
Date: Mon, 11 Jul 2022 19:43:25 -0500
Subject: [PATCH] joystick: Fix spurious battery empty events when opening a
 Shield controller

---
 src/joystick/hidapi/SDL_hidapi_shield.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/joystick/hidapi/SDL_hidapi_shield.c b/src/joystick/hidapi/SDL_hidapi_shield.c
index ef27cb9f8e5..c6d77de5339 100644
--- a/src/joystick/hidapi/SDL_hidapi_shield.c
+++ b/src/joystick/hidapi/SDL_hidapi_shield.c
@@ -155,6 +155,7 @@ HIDAPI_DriverShield_OpenJoystick(SDL_HIDAPI_Device *device, SDL_Joystick *joysti
     joystick->epowerlevel = SDL_JOYSTICK_POWER_UNKNOWN;
 
     /* Request battery and charging info */
+    ctx->battery_level = SDL_JOYSTICK_POWER_UNKNOWN;
     ctx->last_battery_query_time = SDL_GetTicks();
     HIDAPI_DriverShield_SendCommand(device, CMD_CHARGE_STATE, NULL, 0);
     HIDAPI_DriverShield_SendCommand(device, CMD_BATTERY_STATE, NULL, 0);