void abort() {
		if (bufMgr != null) {
			bufMgr.dispose();
			bufMgr = null;
		}
	}
Abort the creation/update of this file.
This method should be invoked in place of close on a failure condition.
An attempt is made to restore the version file to its initial state
or remove it if it was new.
Ghidra/Framework/DB/src/main/java/db/buffers/ChangeMapFile.java