Update comment

backends/aiger/xaiger.cc

@@ -224,7 +224,7 @@ struct XAigerWriter
 
 			// FIXME: Should short here, rather than provide $__ABC_FF_
 			//        to ABC like a user cell
-			//if (cell->type.in("$_FF_" /*, "$_DFF_N_", "$_DFF_P_"*/))
+			//if (cell->type == "$__ABC_FF_")
 			//{
 			//	SigBit D = sigmap(cell->getPort("\\D").as_bit());
 			//	SigBit Q = sigmap(cell->getPort("\\Q").as_bit());