Staging: rtl8723bs: Use kzfree rather than its implementation

Use kzfree instead of memset() + kfree().

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Link: https://lore.kernel.org/r/1567566079-7412-4-git-send-email-zhongjiang@huawei.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>