Revert "ip: fix triggering of 'icmp redirect'"

This reverts commit eb55dc09

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The patch that introduces this bug is reverted right after this one.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>