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/iscsi-brute.nse

@@ -12,7 +12,7 @@ Performs brute force password auditing against iSCSI targets.
 -- @output
 -- PORT     STATE SERVICE
 -- 3260/tcp open  iscsi   syn-ack
--- | iscsi-brute: 
+-- | iscsi-brute:
 -- |   Accounts
 -- |     user:password123456 => Valid credentials
 -- |   Statistics
@@ -30,7 +30,7 @@ categories = {"intrusive", "brute"}
 portrule = shortport.portnumber(3260, "tcp", {"open", "open|filtered"})
 
 Driver = {
-	
+
 	new = function(self, host, port)
 		local o = {}
        	setmetatable(o, self)
@@ -40,22 +40,22 @@ Driver = {
 		o.target = stdnse.get_script_args('iscsi-brute.target')
 		return o
 	end,
-	
+
 	connect = function( self )
 		self.helper = iscsi.Helper:new( self.host, self.port )
 		return self.helper:connect()
 	end,
-	
+
 	login = function( self, username, password )
 		local status = self.helper:login( self.target, username, password, "CHAP")
-		
+
 		if ( status ) then
 			return true, brute.Account:new(username, password, creds.State.VALID)
 		end
-		
+
 		return false, brute.Error:new( "Incorrect password" )
 	end,
-	
+
 	disconnect = function( self )
 		self.helper:close()
 	end,
@@ -68,7 +68,7 @@ action = function( host, port )
 	if ( not(target) ) then
 		return "ERROR: No target specified (see iscsi-brute.target)"
 	end
-	
+
 	local helper = iscsi.Helper:new( host, port )
 	local status, err = helper:connect()
 	if ( not(status) ) then return false, "Failed to connect" end