SDL: Fixed build warning (e385d)

From e385d6da0a8fb77b5493bcd7685ef4d973490550 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Tue, 8 Aug 2023 22:20:49 -0700
Subject: [PATCH] Fixed build warning

---
 src/sensor/SDL_sensor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sensor/SDL_sensor.c b/src/sensor/SDL_sensor.c
index 69b776de9190..20d13c931515 100644
--- a/src/sensor/SDL_sensor.c
+++ b/src/sensor/SDL_sensor.c
@@ -59,7 +59,7 @@ static int SDL_sensors_locked;
 static SDL_bool SDL_sensors_initialized;
 static SDL_Sensor *SDL_sensors SDL_GUARDED_BY(SDL_sensor_lock) = NULL;
 static SDL_AtomicInt SDL_last_sensor_instance_id SDL_GUARDED_BY(SDL_sensor_lock);
-char SDL_sensor_magic;
+static char SDL_sensor_magic;
 
 #define CHECK_SENSOR_MAGIC(sensor, retval)              \
     if (!sensor || sensor->magic != &SDL_sensor_magic) { \