fix spawning bug and add sound

dragons.lua

@@ -756,8 +756,9 @@ minetest.register_node("dmobs:dragon_egg_fire", {
 		minetest.after(100, function(pos, dragon, pname)
 			minetest.remove_node(pos)
 			local ent = minetest.add_entity(pos, "dmobs:dragon_red")
+			minetest.sound_play("dmobs_chirrup",{pos=pos,max_hear_distance=20})
 			local obj = ent:get_luaentity()
-			self.object:set_properties({
+			ent:set_properties({
 				textures = {"dmobs_dragon_young.png"},
 				visual_size = {x=1, y=1},
 			})
@@ -785,6 +786,7 @@ minetest.register_node("dmobs:dragon_egg_lightning", {
 		if wield_item == "dmobs:dragon_gem_lightning" then
 		minetest.after(100, function(pos, dragon, pname)
 			minetest.remove_node(pos)
+			minetest.sound_play("dmobs_chirrup",{pos=pos,max_hear_distance=20})
 			local ent = minetest.add_entity(pos, "dmobs:dragon_black")
 			local obj = ent:get_luaentity()
 			ent:set_properties({
@@ -814,9 +816,10 @@ minetest.register_node("dmobs:dragon_egg_poison", {
 		if wield_item == "dmobs:dragon_gem_poison" then
 		minetest.after(100, function(pos, dragon, pname)
 			minetest.remove_node(pos)
+			minetest.sound_play("dmobs_chirrup",{pos=pos,max_hear_distance=20})
 			local ent = minetest.add_entity(pos, "dmobs:dragon_green")
 			local obj = ent:get_luaentity()
-			obj:set_properties({
+			ent:set_properties({
 				textures = {"dmobs_dragon_young.png"},
 				visual_size = {x=1, y=1},
 			})
@@ -843,9 +846,10 @@ minetest.register_node("dmobs:dragon_egg_ice", {
 		if wield_item == "dmobs:dragon_gem_ice" then
 		minetest.after(100, function(pos, dragon, pname)
 			minetest.remove_node(pos)
+			minetest.sound_play("dmobs_chirrup",{pos=pos,max_hear_distance=20})
 			local ent = minetest.add_entity(pos, "dmobs:dragon_blue")
 			local obj = ent:get_luaentity()
-			obj:set_properties({
+			ent:set_properties({
 				textures = {"dmobs_dragon_young.png"},
 				visual_size = {x=1, y=1},
 			})