SDL: fix SDL_GetJoystickInstanceID() return code upon failure

From 0621a673502e56a24caa129051270b4a55363ad9 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Wed, 11 Jan 2023 21:56:50 +0300
Subject: [PATCH] fix SDL_GetJoystickInstanceID() return code upon failure

Reference issue: https://github.com/libsdl-org/SDL/issues/7051
---
 include/SDL3/SDL_joystick.h | 4 ++--
 src/joystick/SDL_joystick.c | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/SDL3/SDL_joystick.h b/include/SDL3/SDL_joystick.h
index 2db82e1073df..5f67994b927a 100644
--- a/include/SDL3/SDL_joystick.h
+++ b/include/SDL3/SDL_joystick.h
@@ -652,8 +652,8 @@ extern DECLSPEC SDL_bool SDLCALL SDL_JoystickConnected(SDL_Joystick *joystick);
  * Get the instance ID of an opened joystick.
  *
  * \param joystick an SDL_Joystick structure containing joystick information
- * \returns the instance ID of the specified joystick on success or a negative
- *          error code on failure; call SDL_GetError() for more information.
+ * \returns the instance ID of the specified joystick on success or 0 on
+ *          failure; call SDL_GetError() for more information.
  *
  * \since This function is available since SDL 3.0.0.
  *
diff --git a/src/joystick/SDL_joystick.c b/src/joystick/SDL_joystick.c
index 132651e518a4..1ff111b14e68 100644
--- a/src/joystick/SDL_joystick.c
+++ b/src/joystick/SDL_joystick.c
@@ -932,7 +932,7 @@ SDL_JoystickID SDL_GetJoystickInstanceID(SDL_Joystick *joystick)
 
     SDL_LockJoysticks();
     {
-        CHECK_JOYSTICK_MAGIC(joystick, -1);
+        CHECK_JOYSTICK_MAGIC(joystick, 0);
 
         retval = joystick->instance_id;
     }