Free metadata upon avifenc exit
diff --git a/apps/avifenc.c b/apps/avifenc.c
index 8e68ea3..7529e89 100644
--- a/apps/avifenc.c
+++ b/apps/avifenc.c
@@ -1270,6 +1270,9 @@
         avifImageDestroy(nextImage);
     }
     avifRWDataFree(&raw);
+    avifRWDataFree(&exifOverride);
+    avifRWDataFree(&xmpOverride);
+    avifRWDataFree(&iccOverride);
     free((void *)input.files);
     return returnCode;
 }