ASoC: rockchip: fix a misjudgement by return

Being careless, judge the return value of snd_soc_card_jack_new
is opposite, so it should be fixed.

Signed-off-by: Xing Zheng <zhengxing@rock-chips.com>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>