SDL: SDL_malloc.c: fix variable 'used' set but not used

SDL Commits
1 
From b51a88a95c27823cccdc02d96d7bc05ce912bd8d Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Thu, 6 Oct 2022 02:23:57 +0200
Subject: [PATCH] SDL_malloc.c: fix variable 'used' set but not used

Emitted by clang-cl
---
 src/stdlib/SDL_malloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/stdlib/SDL_malloc.c b/src/stdlib/SDL_malloc.c
index 1e986f6152e7..093a2a0e9eb2 100644
--- a/src/stdlib/SDL_malloc.c
+++ b/src/stdlib/SDL_malloc.c
@@ -3017,6 +3017,8 @@ internal_malloc_stats(mstate m)
                 (unsigned long) (maxfp));
         fprintf(stderr, "system bytes     = %10lu\n", (unsigned long) (fp));
         fprintf(stderr, "in use bytes     = %10lu\n", (unsigned long) (used));
+#else
+        (void)used;
 #endif
 
         POSTACTION(m);