couple wrong return types

src/server/game/AI/ScriptedAI/ScriptedCreature.cpp

@@ -177,11 +177,11 @@ SpellInfo const* ScriptedAI::SelectSpell(Unit* target, uint32 school, uint32 mec
 {
     //No target so we can't cast
     if (!target)
-        return false;
+        return NULL;
 
     //Silenced so we can't cast
     if (me->HasFlag(UNIT_FIELD_FLAGS, UNIT_FLAG_SILENCED))
-        return false;
+        return NULL;
 
     //Using the extended script system we first create a list of viable spells
     SpellInfo const* apSpell[CREATURE_MAX_SPELLS];