private void clearFallThroughRefs(Address keepFallThroughAddr) {
		if (clearingFallThroughs) {
			return;
		}
		validate(lock);
		clearingFallThroughs = true;
		try {
			boolean fallThroughPreserved = false;
			for (Reference ref : refMgr.getReferencesFrom(address)) {
				if (ref.getReferenceType() == RefType.FALL_THROUGH) {
					if (!fallThroughPreserved && ref.getToAddress().equals(keepFallThroughAddr)) {
						fallThroughPreserved = true; // only preserve one
					}
					else {
						refMgr.delete(ref);
					}
				}
			}
		}
		finally {
			clearingFallThroughs = false;
		}
	}
Clear all existing fall-through references from address.
@param keepFallThroughAddr if not null, corresponding fall-through reference will be 
preserved.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/code/InstructionDB.java