net/ipv4: Allow notifier to fail route replace
Add checking to call to call_fib_entry_notifiers for IPv4 route replace. Allows a notifier handler to fail the replace. Signed-off-by: NDavid Ahern <dsa@cumulusnetworks.com> Reviewed-by: NIdo Schimmel <idosch@mellanox.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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