Fixed segfault in MPI mode.

src/cell.c

@@ -557,8 +557,9 @@ void cell_init_parts(struct cell *c, void *data) {
 
   struct part *p = c->parts;
   struct xpart *xp = c->xparts;
+  const int count = c->count;
 
-  for (int i = 0; i < c->count; ++i) {
+  for (int i = 0; i < count; ++i) {
     p[i].ti_begin = 0;
     p[i].ti_end = 0;
     xp[i].v_full[0] = p[i].v[0];

src/engine.c

@@ -1720,14 +1720,14 @@ void engine_init_particles(struct engine *e) {
 
   struct space *s = e->s;
 
-  message("Initialising particles");
-
-  engine_prepare(e);
+  if(e->nodeID == 0) message("Initialising particles");
 
   /* Make sure all particles are ready to go */
   /* i.e. clean-up any stupid state in the ICs */
   space_map_cells_pre(s, 1, cell_init_parts, NULL);
 
+  engine_prepare(e);
+
   engine_marktasks(e);
 
   // printParticle(e->s->parts, 1000, e->s->nr_parts);