selftests: net: fix nexthop warning cleanup double ip typo

stable inclusion
from stable-v5.10.158
commit 4919503426c93c5a254148db08796a695245bf94
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7NTXH

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4919503426c93c5a254148db08796a695245bf94



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[ Upstream commit 692930cc ]

I made a stupid typo when adding the nexthop route warning selftest and
added both $IP and ip after it (double ip) on the cleanup path. The
error doesn't show up when running the test, but obviously it doesn't
cleanup properly after it.

Fixes: 392baa33 ("selftests: net: add delete nexthop route warning test")
Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: d5082d38 ("ipv4: Fix route deletion when nexthop info is not specified")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: sanglipeng <sanglipeng1@jd.com>