Adding limit on the number of live BDD nodes in command 'muxes -g'.

src/base/abci/abc.c

@@ -11042,7 +11042,7 @@ int Abc_CommandMuxes( Abc_Frame_t * pAbc, int argc, char ** argv )
     if ( pNtkRes == NULL )
     {
         Abc_Print( -1, "Converting to MUXes has failed.\n" );
-        return 1;
+        return 0;
     }
     // replace the current network
     Abc_FrameReplaceCurrentNetwork( pAbc, pNtkRes );