SDL_image: test: Use correct macro for PNG enabledness

SDL Commits
1 
From 6249b9a27283f483a38bf69561d2a01cd4d214bc Mon Sep 17 00:00:00 2001
From: Simon McVittie <[EMAIL REDACTED]>
Date: Mon, 23 May 2022 23:14:31 +0100
Subject: [PATCH] test: Use correct macro for PNG enabledness

Signed-off-by: Simon McVittie <smcv@collabora.com>
---
 test/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/test/main.c b/test/main.c
index 3a47ffc..b0fe615 100644
--- a/test/main.c
+++ b/test/main.c
@@ -298,7 +298,7 @@ static const Format formats[] =
         42,
         0,              /* lossless */
         IMG_INIT_PNG,
-#ifdef LOAD_PNM
+#ifdef LOAD_PNG
         SDL_TRUE,
 #else
         SDL_FALSE,