Properly initialize variable in WorldObject::PlayDirectSound()

Fixes issue 2838

--HG--
branch : trunk

src/server/game/Maps/Map.cpp

@@ -3428,7 +3428,7 @@ void Map::ScriptsProcess()
 
                 // when script called for item spell casting then target == (unit or GO) and source is player
                 WorldObject* worldObject;
-                Player* pTarget;
+                Player* pTarget = NULL;
 
                 pTarget = target->ToPlayer();
                 if (pTarget)