Changes to get fuzz targets building again after img_info cache membe…

…r changes

ossfuzz/fls_apfs_fuzzer.cc

@@ -54,7 +54,7 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   tsk_pool_close(pool);
 
 out_img:
-  tsk_img_close(img);
+  img->close(img);
 
   return 0;
 }