Merge branch 'net-redundant-judgments'

Li Zetao says:

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net: Delete some redundant judgments

This patchset aims to remove some unnecessary judgments and make the
code more concise. In some network modules, rtnl_set_sk_err is used to
record error information, but the err is repeatedly judged to be less
than 0 on the error path. Deleted these redundant judgments.

No functional change intended.
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Signed-off-by: David S. Miller <davem@davemloft.net>