misc: mic: Use PTR_ERR_OR_ZERO rather than its implementation

PTR_ERR_OR_ZERO contains if(IS_ERR(...)) + PTR_ERR. It is better to
use it directly. hence just replace it.

Signed-off-by: zhong jiang <zhongjiang@huawei.com>
Link: https://lore.kernel.org/r/1567665795-5901-3-git-send-email-zhongjiang@huawei.com


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