selftests: forwarding: fix error message in learning_test

When packets are not received, they aren't received on $host1_if, so the
message talking about the second host not receiving them is incorrect.
Fix it.

Fixes: d4deb014 ("selftests: forwarding: Add a test for FDB learning")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

tools/testing/selftests/net/forwarding/lib.sh

@@ -1251,7 +1251,7 @@ learning_test()
 	tc -j -s filter show dev $host1_if ingress \
 		| jq -e ".[] | select(.options.handle == 101) \
 		| select(.options.actions[0].stats.packets == 1)" &> /dev/null
-	check_fail $? "Packet reached second host when should not"
+	check_fail $? "Packet reached first host when should not"
 
 	$MZ $host1_if -c 1 -p 64 -a $mac -t ip -q
 	sleep 1