SDL: Lock joysticks when adding gamepad mappings

SDL Commits
1 
From 70fd8e2ba29522dfeaa897dc4a37ab59f8b25f92 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 19 Oct 2023 22:35:53 -0700
Subject: [PATCH] Lock joysticks when adding gamepad mappings

Fixes https://github.com/libsdl-org/SDL/issues/8412
---
 src/joystick/SDL_gamepad.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/joystick/SDL_gamepad.c b/src/joystick/SDL_gamepad.c
index 6bb982c57e37..1af2159a5d53 100644
--- a/src/joystick/SDL_gamepad.c
+++ b/src/joystick/SDL_gamepad.c
@@ -1670,6 +1670,8 @@ int SDL_AddGamepadMappingsFromRW(SDL_RWops *src, SDL_bool freesrc)
     }
     line = buf;
 
+    SDL_LockJoysticks();
+
     PushMappingChangeTracking();
 
     while (line < buf + db_size) {
@@ -1702,6 +1704,8 @@ int SDL_AddGamepadMappingsFromRW(SDL_RWops *src, SDL_bool freesrc)
 
     PopMappingChangeTracking();
 
+    SDL_UnlockJoysticks();
+
     SDL_free(buf);
     return gamepads;
 }