synchronized void releaseFileCacheEntry(String md5) {
		FileCacheEntry fce = memCache.get(md5);
		if (fce != null) {
			memCache.remove(md5);
			Msg.debug(this, "Releasing memCache entry: " + fce.md5 + ", " + fce.bytes.length);
		}
	}
Returns a {@link FileCacheEntry} for the matching file, based on its MD5, or
NULL if there is no matching file.
<p>
Tweaks the file's last modified time to implement a LRU.

@param md5 md5 string.
@return {@link FileCacheEntry} with a File and it's md5 string or {@code null} if no
matching file exists in cache.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/FileCache.java