Add a close method to the file output

git-svn-id: file:///home/svn/framework3/trunk@9189 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/ui/text/output/file.rb

@@ -25,10 +25,16 @@ class Output::File < Rex::Ui::Text::Output
 	# Prints the supplied message to file output.
 	#
 	def print_raw(msg = '')
+		return if not self.fd
 		self.fd.write(msg)
 		self.fd.flush
 		msg
 	end
+
+	def close
+		self.fd.close if self.fd
+		self.fd = nil
+	end
 end
 
 end