Remove unused and clean up missused variable-value assignments.

* Unused variables
* Unused values (assigned to variables, but overwritten before use)
* Defining already defined variables instead of reassigning to them.

mods/beds/functions.lua

@@ -100,7 +100,7 @@ end
 
 local function update_formspecs(finished)
 	local ges = #minetest.get_connected_players()
-	local form_n = ""
+	local form_n
 	local is_majority = (ges / 2) < player_in_bed
 
 	if finished then

mods/beds/spawns.lua

@@ -32,8 +32,6 @@ function beds.read_spawns()
 		beds.save_spawns()
 		os.rename(file, file .. ".backup")
 		file = org_file
-	else
-		spawns = {}
 	end
 end