selftests: net: fix nexthop warning cleanup double ip typo

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: NNikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/fib_nexthops.sh

@@ -1220,8 +1220,8 @@ ipv4_fcnal()
 	[ $out1 -eq $out2 ]
 	rc=$?
 	log_test $rc 0 "Delete nexthop route warning"
-	run_cmd "$IP ip route delete 172.16.101.1/32 nhid 12"
-	run_cmd "$IP ip nexthop del id 12"
+	run_cmd "$IP route delete 172.16.101.1/32 nhid 12"
+	run_cmd "$IP nexthop del id 12"
 }
 
 ipv4_grp_fcnal()