Fix wrong type cast.

src/sat/satoko/solver.c

@@ -437,7 +437,7 @@ static inline void solver_reduce_cdb(solver_t *s)
 
     limit = (unsigned)(n_learnts * s->opts.learnt_ratio);
 
-    satoko_sort((void *)learnts_cls, n_learnts,
+    satoko_sort((void **)learnts_cls, n_learnts,
             (int (*)(const void *, const void *)) clause_compare);
 
     if (learnts_cls[n_learnts / 2]->lbd <= 3)

src/sat/xsat/xsatSolver.c

@@ -790,7 +790,7 @@ void xSAT_SolverReduceDB( xSAT_Solver_t * s )
 
     limit = nLearnedOld / 2;
 
-    xSAT_UtilSort((void *) learnts_cls, nLearnedOld,
+    xSAT_UtilSort((void **) learnts_cls, nLearnedOld,
                   (int (*)( const void *, const void * )) xSAT_ClauseCompare);
 
     if ( learnts_cls[nLearnedOld / 2]->nLBD <= 3 )