Fixed mob_spawn_dataset() not initializing the spawn_timer variable (followup to r13497).

git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@13498 54d463be-8e91-2dee-dedb-b68131a5f0ec

src/map/mob.c

@@ -226,6 +226,7 @@ struct mob_data* mob_spawn_dataset(struct spawn_data *data)
 
 	if(md->db->status.mode&MD_LOOTER)
 		md->lootitem = (struct item *)aCalloc(LOOTITEM_SIZE,sizeof(struct item));
+	md->spawn_timer = INVALID_TIMER;
 	md->deletetimer = INVALID_TIMER;
 	md->skillidx = -1;
 	status_set_viewdata(&md->bl, md->class_);