Remove trailing whitespace in lua files

Whitespace is not significant, so this should not be a problem.
https://secwiki.org/w/Nmap/Code_Standards

scripts/http-errors.nse

@@ -10,10 +10,10 @@ applications make sure to increase httpspider's <code>maxpagecount</code> value.
 Please, note that the script will become more intrusive though.
 ]]
 
---- 
--- @usage nmap -p80 --script http-errors.nse <target>  
+---
+-- @usage nmap -p80 --script http-errors.nse <target>
 --
--- @args http-errors.errcodes The error codes we are interested in. 
+-- @args http-errors.errcodes The error codes we are interested in.
 --       Default: nil (all codes >= 400)
 --
 -- @output
@@ -21,14 +21,14 @@ Please, note that the script will become more intrusive though.
 -- 80/tcp open  http    syn-ack
 -- | http-errors:
 -- | Spidering limited to: maxpagecount=40; withinhost=some-random-page.com
--- |   Found the following error pages: 
--- |   
+-- |   Found the following error pages:
+-- |
 -- |   Error Code: 404
 -- |       http://some-random-page.com/admin/
--- |   
+-- |
 -- |   Error Code: 404
 -- |       http://some-random-page.com/foo.html
--- |    
+-- |
 -- |   Error Code: 500
 -- |_      http://some-random-page.com/p.php
 ---
@@ -54,27 +54,27 @@ local function inTable(tbl, item)
 
     item = tostring(item)
     for key, value in pairs(tbl) do
-        if value == tostring(item) then 
-            return true 
+        if value == tostring(item) then
+            return true
         end
     end
     return nil
 
 end
 
-action = function(host, port) 
+action = function(host, port)
 
     local errcodes = stdnse.get_script_args("http-errors.errcodes") or nil
 
-    local crawler = httpspider.Crawler:new(host, port, '/', { scriptname = SCRIPT_NAME, 
-                                                              maxpagecount = 40, 
-                                                              maxdepth = -1, 
+    local crawler = httpspider.Crawler:new(host, port, '/', { scriptname = SCRIPT_NAME,
+                                                              maxpagecount = 40,
+                                                              maxdepth = -1,
                                                               withinhost = 1
                                                               })
 
     crawler.options.doscraping = function(url)
-        if crawler:iswithinhost(url) 
-        and not crawler:isresource(url, "js") 
+        if crawler:iswithinhost(url)
+        and not crawler:isresource(url, "js")
         and not crawler:isresource(url, "css") then
             return true
         end
@@ -85,9 +85,9 @@ action = function(host, port)
     local errors = {}
 
     while (true) do
- 
+
         local response, path
-        
+
         local status, r = crawler:crawl()
         -- if the crawler fails it can be due to a number of different reasons
         -- most of them are "legitimate" and should not be reason to abort
@@ -101,8 +101,8 @@ action = function(host, port)
 
         response = r.response
         path = tostring(r.url)
-                
-        if (response.status >= 400 and not errcodes) or 
+
+        if (response.status >= 400 and not errcodes) or
         ( errcodes and type(errcodes) == "table" and inTable(errcodes, response.status) ) then
             table.insert(errors, { tostring(response.status), path })
         end
@@ -112,7 +112,7 @@ action = function(host, port)
     -- If the table is empty.
     if next(errors) == nil then
         return "Couldn't find any error pages."
-    end 
+    end
 
     table.sort(errors, compare)
 
@@ -126,7 +126,7 @@ action = function(host, port)
     table.insert(results, 1, "Found the following error pages: ")
 
 	results.name = crawler:getLimitations()
-	
+
 	return stdnse.format_output(true, results)
 
 end