staging: android: ram_console use kmemdup instead of kmalloc

	if (ram_console_old_log == NULL)

		return 0;

#ifdef CONFIG_ANDROID_RAM_CONSOLE_EARLY_INIT

	ram_console_old_log = kmalloc(ram_console_old_log_size, GFP_KERNEL);

	ram_console_old_log = kmemdup(ram_console_old_log_init_buffer,

					ram_console_old_log_size, GFP_KERNEL);

	if (ram_console_old_log == NULL) {

		printk(KERN_ERR

		       "ram_console: failed to allocate buffer for old log\n");

		ram_console_old_log_size = 0;

		return 0;

	}

	memcpy(ram_console_old_log,

	       ram_console_old_log_init_buffer, ram_console_old_log_size);

#endif

	entry = create_proc_entry("last_kmsg", S_IFREG | S_IRUGO, NULL);

	if (!entry) {