Core/Groups: fixed a crash when rolling for items

src/server/game/Groups/Group.cpp

@@ -1434,7 +1434,6 @@ void Group::CountTheRoll(Rolls::iterator rollI, Map* allowedMap)
     if (!roll->isValid())                                   // is loot already deleted ?
     {
         RollId.erase(rollI);
-        delete roll;
         return;
     }
 
@@ -1612,7 +1611,6 @@ void Group::CountTheRoll(Rolls::iterator rollI, Map* allowedMap)
     }
 
     RollId.erase(rollI);
-    delete roll;
 }
 
 void Group::SetTargetIcon(uint8 id, ObjectGuid whoGuid, ObjectGuid targetGuid)