SDL: Fixed float conversion warning

SDL Commits
1 
From 756921a04968c0e5edeed4c6d22388ae9681ac9b Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 22 Feb 2023 15:33:47 -0800
Subject: [PATCH] Fixed float conversion warning

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

diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index 2c09204f8f0c..6b3358cbc6c3 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -1026,7 +1026,7 @@ const SDL_DisplayMode *SDL_GetClosestFullscreenDisplayMode(SDL_DisplayID display
         aspect_ratio = 1.0f;
     }
 
-    if (!refresh_rate) {
+    if (refresh_rate == 0.0f) {
         mode = SDL_GetDesktopDisplayMode(displayID);
         if (mode) {
             refresh_rate = mode->refresh_rate;