The initialization for 'err' with '-EINVAL' is redundant and
can be removed, as it is updated soon.

Changes since v1:
- Remove redundant empty line
Signed-off-by: NMenglong Dong <dong.menglong@zte.com.cn>
Link: https://lore.kernel.org/r/20201108010541.12432-1-dong.menglong@zte.com.cnSigned-off-by: NJakub Kicinski <kuba@kernel.org>