SDL: Fixed return value for SDL_UDEV_AddCallback()

From 8c285828e586f535b949ce8de05979cf07d44744 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Fri, 15 Dec 2023 10:06:01 -0800
Subject: [PATCH] Fixed return value for SDL_UDEV_AddCallback()

Fixes https://github.com/libsdl-org/SDL/issues/8694
---
 src/core/linux/SDL_udev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/linux/SDL_udev.c b/src/core/linux/SDL_udev.c
index 72a527e036af..59d37d0e9fdd 100644
--- a/src/core/linux/SDL_udev.c
+++ b/src/core/linux/SDL_udev.c
@@ -530,7 +530,7 @@ int SDL_UDEV_AddCallback(SDL_UDEV_Callback cb)
         _this->last = item;
     }
 
-    return 1;
+    return 0;
 }
 
 void SDL_UDEV_DelCallback(SDL_UDEV_Callback cb)