Merge branch 'r8169-use-napi_complete_done-return-value'

Heiner Kallweit says:

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r8169: use napi_complete_done return value

Consider the return value of napi_complete_done(), this allows users to
use the gro_flush_timeout sysfs attribute as an alternative to classic
interrupt coalescing.
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Signed-off-by: David S. Miller <davem@davemloft.net>