fix: KeyValues memory leak in birds

src/game/server/tf/entity_bird.cpp

@@ -90,7 +90,10 @@ void CEntityBird::SpawnRandomBirds( void )
 
 	KeyValues *pFileKV = new KeyValues( "birds" );
 	if ( !pFileKV->LoadFromFile( g_pFullFileSystem, "scripts/birds.txt", "MOD" ) )
+	{
+		pFileKV->deleteThis();
 		return;
+	}
 
 	// Build a list of birds in the map already, and make sure we don't spawn any on those spots again
 	CUtlVector<Vector>	vecExistingBirds;