private boolean fallthroughCall(Program program, Reference ref) {
		// get the instruction that is calling here
		// if it falls through to here, then this is a fallthroughCall
		Address from = ref.getFromAddress();
		Instruction instr = program.getListing().getInstructionAt(from);
		if (instr == null) {
			return false;
		}
		if (instr.getFallThrough() == ref.getToAddress()) {
			return true;
		}
		return false;
	}
Check if this reference is from a call instruction that also
   falls through to the called location.
@param program
@param ref
@return true if the call also falls through to this instruction
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/function/FunctionAnalyzer.java