Small FXCH bug fix.

src/opt/fxch/FxchSCHashTable.c

@@ -219,6 +219,9 @@ int Fxch_SCHashTableInsert( Fxch_SCHashTable_t* pSCHashTable,
         int Base;
         int iNewDiv = -1, i, z;
 
+        if ( (pEntry->iLit1 != 0 && pNewEntry->iLit1 == 0) || (pEntry->iLit1 == 0 && pNewEntry->iLit1 != 0)  )
+            continue;
+
         if ( !Fxch_SCHashTableEntryCompare( pSCHashTable, vCubes, pEntry, pNewEntry ) )
             continue;
 
@@ -309,6 +312,9 @@ int Fxch_SCHashTableRemove( Fxch_SCHashTable_t* pSCHashTable,
         int* pOutputID1 = Vec_IntEntryP( pSCHashTable->pFxchMan->vOutputID, pNextEntry->iCube * pSCHashTable->pFxchMan->nSizeOutputID );
         int Result = 0;
 
+        if ( (pEntry->iLit1 != 0 && pNextEntry->iLit1 == 0) || (pEntry->iLit1 == 0 && pNextEntry->iLit1 != 0)  )
+            continue;
+
         if ( !Fxch_SCHashTableEntryCompare( pSCHashTable, vCubes, pEntry, pNextEntry )
              || pEntry->iLit0 == 0
              || pNextEntry->iLit0 == 0 )