*Fix a crash caused by memory corruption introduced in 2665.

--HG--
branch : trunk

src/game/Unit.cpp

@@ -3739,7 +3739,7 @@ bool Unit::AddAura(Aura *Aur)
             else
                 foundAura->RefreshAura();
             delete Aur;
-            return true;
+            return false;
         }
     }