GHSA-xgm3-v4r9-wfgm

Memory leak exists in `coders/ashlar.c`. The `WriteASHLARImage` allocates a structure. However, when an exception is thrown, the allocated memory is not properly released, resulting in a potential memory leak.

``` ```bash ==78968== Memcheck, a memory error detector ==78968== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al. ==78968== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info ==78968== ==78968== HEAP SUMMARY: ==78968== in use at exit: 17,232 bytes in 4 blocks ==78968== total heap usage: 4,781 allocs, 4,777 frees, 785,472 bytes allocated ```