SDL_image: Seek past ANI chunks that we don't handle

SDL Commits
1 
From 0e2eaa923ddea285dfa35c4bf0c0092d3799e2ee Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Mon, 1 Jun 2026 22:14:57 -0700
Subject: [PATCH] Seek past ANI chunks that we don't handle

---
 src/IMG_ani.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/IMG_ani.c b/src/IMG_ani.c
index bc705a43..d74afb8e 100644
--- a/src/IMG_ani.c
+++ b/src/IMG_ani.c
@@ -328,6 +328,9 @@ static bool ParseList(IMG_AnimationParseContext *parse, Uint32 size)
         return ParseFrameList(parse, size);
     } else {
         // Unknown list chunk, ignore it
+        if (SDL_SeekIO(src, size, SDL_IO_SEEK_CUR) < 0) {
+            return false;
+        }
         return true;
     }
 }
@@ -344,6 +347,9 @@ static bool ParseSequenceChunk(IMG_AnimationParseContext *parse, Uint32 size)
 
     if (!(anih->fl & ANI_FLAG_SEQUENCE)) {
         // The header says we don't use sequence data, ignore it
+        if (SDL_SeekIO(src, size, SDL_IO_SEEK_CUR) < 0) {
+            return false;
+        }
         return true;
     }