Bug fix.

src/base/abc/abcFanio.c

@@ -87,7 +87,7 @@ void Abc_ObjAddFanin( Abc_Obj_t * pObj, Abc_Obj_t * pFanin )
     assert( !Abc_ObjIsComplement(pObj) );
     assert( pObj->pNtk == pFaninR->pNtk );
     assert( pObj->Id >= 0 && pFaninR->Id >= 0 );
-    assert( !Abc_ObjIsPi(pObj) && !Abc_ObjIsPo(pFanin) );    // fanin of PI or fanout of PO
+    assert( !Abc_ObjIsPi(pObj) && !Abc_ObjIsPo(pFaninR) );    // fanin of PI or fanout of PO
     assert( !Abc_ObjIsCo(pObj) || !Abc_ObjFaninNum(pObj) );  // CO with two fanins
     assert( !Abc_ObjIsNet(pObj) || !Abc_ObjFaninNum(pObj) ); // net with two fanins
     Vec_IntPushMem( pObj->pNtk->pMmStep, &pObj->vFanins,     pFaninR->Id );