[mcl_ocean] fix warnings

mods/ITEMS/mcl_ocean/kelp.lua

@@ -38,7 +38,7 @@ local mt_is_creative_enabled = minetest.is_creative_enabled
 local mt_sound_play = minetest.sound_play
 
 local math = math
-local string = string
+--local string = string
 local table = table
 
 -- DEBUG: functions
@@ -422,7 +422,7 @@ end
 
 
 function kelp.surface_after_dig_node(pos, node)
-	return mt_set_node(pos, {name=registred_nodes[node.name].node_dig_prediction})
+	return mt_set_node(pos, {name=minetest.registered_nodes[node.name].node_dig_prediction})
 end
 
 
@@ -759,7 +759,6 @@ minetest.register_craftitem("mcl_ocean:dried_kelp", {
 	groups = { food = 2, eatable = 1 },
 	on_place = minetest.item_eat(1),
 	on_secondary_use = minetest.item_eat(1),
-	groups = { food = 2, eatable = 1 },
 	_mcl_saturation = 0.6,
 })
 

mods/ITEMS/mcl_ocean/sea_pickle.lua

@@ -12,7 +12,7 @@ local function sea_pickle_on_place(itemstack, placer, pointed_thing)
 	local node_under = minetest.get_node(pos_under)
 	local node_above = minetest.get_node(pos_above)
 	local def_under = minetest.registered_nodes[node_under.name]
-	local def_above = minetest.registered_nodes[node_above.name]
+	--local def_above = minetest.registered_nodes[node_above.name]
 
 	if def_under and def_under.on_rightclick and not placer:get_player_control().sneak then
 		return def_under.on_rightclick(pos_under, node_under,

mods/ITEMS/mcl_ocean/seagrass.lua

@@ -105,7 +105,7 @@ for s=1, #surfaces do
 		doc_longdesc = S("Seagrass grows inside water on top of dirt, sand or gravel.")
 		desc = S("Seagrass")
 		doc_create = true
-		doc_img = "mcl_ocean_seagrass.png"
+		doc_img = "mcl_ocean_seagrass.png^[verticalframe:12:0"
 	else
 		doc_create = false
 	end
@@ -113,7 +113,7 @@ for s=1, #surfaces do
 		_doc_items_entry_name = desc,
 		_doc_items_longdesc = doc_longdesc,
 		_doc_items_create_entry = doc_create,
-		_doc_items_image = "mcl_ocean_seagrass.png^[verticalframe:12:0",
+		_doc_items_image = doc_img,
 		drawtype = "plantlike_rooted",
 		paramtype = "light",
 		paramtype2 = "meshoptions",