fix bug in scriptapi line_of_sight

fix warnings for pathfinder debug traces

src/pathfinder.cpp

@@ -687,9 +687,8 @@ bool pathfinder::update_all_costs(	v3s16 ipos,
 
 				if ((g_pos2.totalcost < 0) ||
 						(g_pos2.totalcost > new_cost)) {
-					int old_cost = g_pos2.totalcost;
 					DEBUG_OUT(LVL "Pathfinder: updating path at: "<<
-							PPOS(ipos2) << " from: " << old_cost << " to "<<
+							PPOS(ipos2) << " from: " << g_pos2.totalcost << " to "<<
 							new_cost << std::endl);
 					if (update_all_costs(ipos2,invert(directions[i]),
 											new_cost,level)) {
@@ -847,9 +846,8 @@ bool pathfinder::update_cost_heuristic(	v3s16 ipos,
 
 				if ((g_pos2.totalcost < 0) ||
 						(g_pos2.totalcost > new_cost)) {
-					int old_cost = g_pos2.totalcost;
 					DEBUG_OUT(LVL "Pathfinder: updating path at: "<<
-							PPOS(ipos2) << " from: " << old_cost << " to "<<
+							PPOS(ipos2) << " from: " << g_pos2.totalcost << " to "<<
 							new_cost << " srcdir=" <<
 							PPOS(invert(direction))<< std::endl);
 					if (update_cost_heuristic(ipos2,invert(direction),

src/scriptapi_env.cpp

@@ -662,9 +662,11 @@ int EnvRef::l_line_of_sight(lua_State *L) {
 	v3f pos2 = checkFloatPos(L, 2);
 	//read step size from lua
 	if(lua_isnumber(L, 3))
-	stepsize = lua_tonumber(L, 3);
+		stepsize = lua_tonumber(L, 3);
 
-	return (env->line_of_sight(pos1,pos2,stepsize));
+	lua_pushboolean(L, env->line_of_sight(pos1,pos2,stepsize));
+
+	return 1;
 }
 
 int EnvRef::l_find_path(lua_State *L)