private static File[] getChangeFiles(LocalBufferFile bf) {
		File dir = bf.getFile().getParentFile();
		return new File[] { new File(dir, SNAPSHOT1_CHANGESET_FILE),
			new File(dir, SNAPSHOT2_CHANGESET_FILE) };
	}
Returns the recovery change data file for reading or null if one is not available.
The caller must dispose of the returned file before peforming generating any new
recovery snapshots.
@throws IOException
Ghidra/Framework/DB/src/main/java/db/buffers/RecoveryMgr.java