SDL: win32: Set error for SDL_GL_GetSwapInterval()

SDL Commits
1 
From 54de246b4b44610f7418495ee0485ddbc6e8cd20 Mon Sep 17 00:00:00 2001
From: Zack Middleton <[EMAIL REDACTED]>
Date: Mon, 16 Feb 2026 13:17:01 -0600
Subject: [PATCH] win32: Set error for SDL_GL_GetSwapInterval()

---
 src/video/windows/SDL_windowsopengl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/video/windows/SDL_windowsopengl.c b/src/video/windows/SDL_windowsopengl.c
index f7b22ed0f09d3..5e3b79c196ed6 100644
--- a/src/video/windows/SDL_windowsopengl.c
+++ b/src/video/windows/SDL_windowsopengl.c
@@ -910,7 +910,7 @@ bool WIN_GL_GetSwapInterval(SDL_VideoDevice *_this, int *interval)
         *interval = _this->gl_data->wglGetSwapIntervalEXT();
         return true;
     } else {
-        return false;
+        return SDL_Unsupported();
     }
 }