Set max image size to 16384 * 16384

Fix https://crbug.com/oss-fuzz/24728 and
https://crbug.com/oss-fuzz/24734.

src/read.c

diff --git a/src/read.c b/src/read.c
index e992219..fa1a513 100644
--- a/src/read.c
+++ b/src/read.c
@@ -980,6 +980,9 @@
         CHECK(avifROStreamReadU32(&s, &grid->outputWidth));  // unsigned int(FieldLength) output_width;
         CHECK(avifROStreamReadU32(&s, &grid->outputHeight)); // unsigned int(FieldLength) output_height;
     }
+    if (grid->outputWidth > AVIF_MAX_IMAGE_SIZE / grid->outputHeight) {
+        return AVIF_FALSE;
+    }
     return AVIF_TRUE;
 }