SDL: Fix assertion in LINUX_JoystickSetSensorsEnabled()

From f30392da5bd51da3fb8b74eab3f9193d0194ee2a Mon Sep 17 00:00:00 2001
From: Mathieu Eyraud <[EMAIL REDACTED]>
Date: Thu, 5 Oct 2023 19:44:15 +0200
Subject: [PATCH] Fix assertion in LINUX_JoystickSetSensorsEnabled()

Calling LINUX_JoystickSetSensorsEnabled() after the joystick is unplugged will trigger this assertion.
---
 src/joystick/linux/SDL_sysjoystick.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/joystick/linux/SDL_sysjoystick.c b/src/joystick/linux/SDL_sysjoystick.c
index ade45ed90116..fea20069544f 100644
--- a/src/joystick/linux/SDL_sysjoystick.c
+++ b/src/joystick/linux/SDL_sysjoystick.c
@@ -1565,7 +1565,9 @@ static int LINUX_JoystickSetSensorsEnabled(SDL_Joystick *joystick, SDL_bool enab
     }
 
     if (enabled) {
-        SDL_assert(joystick->hwdata->item_sensor);
+        if (joystick->hwdata->item_sensor == NULL) {
+            return SDL_SetError("Sensors unplugged.");
+        }
         joystick->hwdata->fd_sensor = open(joystick->hwdata->item_sensor->path, O_RDONLY | O_CLOEXEC, 0);
         if (joystick->hwdata->fd_sensor < 0) {
             return SDL_SetError("Couldn't open sensor file %s.", joystick->hwdata->item_sensor->path);