ASoC: rockchip: i2s-tdm: Fix error handling on i2s_tdm_prepare_enable_mclk failure

In the case where the call to i2s_tdm_prepare_enable_mclk fails the
function returns before the error handling goto is executed. Fix this
by removing the return do perform the intended error handling exit.

Fixes: 081068fd ("ASoC: rockchip: add support for i2s-tdm controller")
Addresses-Coverity: ("Structurally dead code")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Message-Id: <20211008095430.62680-2-colin.king@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>