sdl12-compat: minor build fix.

SDL Commits
1 
From 0232ad4e6d7bc27c1d3d0fa3bbd9b1dd9f883fa5 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Fri, 18 Jun 2021 14:30:50 +0300
Subject: [PATCH] minor build fix.

---
 src/SDL12_compat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/SDL12_compat.c b/src/SDL12_compat.c
index ff2d045..54ab6c7 100644
--- a/src/SDL12_compat.c
+++ b/src/SDL12_compat.c
@@ -1642,7 +1642,7 @@ Init12Video(void)
     SDL_DisplayMode mode;
     int i;
 
-    IsDummyVideo = driver && (SDL20_strcmp(driver, "dummy") == 0);
+    IsDummyVideo = ((driver != NULL) && (SDL20_strcmp(driver, "dummy") == 0)) ? SDL_TRUE : SDL_FALSE;
 
     for (i = 0; i < SDL12_MAXEVENTS-1; i++)
         EventQueuePool[i].next = &EventQueuePool[i+1];