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