testing wrong policy variable.

Former-commit-id: 37b6d782c28727a1586a72986c593c4b8f19eb69

src/engine.c

@@ -734,7 +734,7 @@ void engine_init ( struct engine *e , struct space *s , float dt , int nr_thread
         int nr_cores = sysconf( _SC_NPROCESSORS_ONLN );
         int i, j, cpuid[ nr_cores ];
         cpu_set_t cpuset;
-        if ( e->policy & engine_policy_cputight ) {
+        if ( policy & engine_policy_cputight ) {
             for ( k = 0 ; k < nr_cores ; k++ )
                 cpuid[k] = k;
             }