@Override
	public void clearFallThroughOverride() {
		lock.acquire();
		try {
			checkDeleted();
			if (!isFallThroughOverridden()) {
				return;
			}
			// clear fall-through override
			clearFallThroughRefs(null);
			setFallthroughOverride(false);
			addLengthOverrideFallthroughRef(); // restore length-override fallthrough if needed
		}
		finally {
			lock.release();
		}

	}
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