ASoC: fsl_easrc: Fix uninitialized scalar variable in fsl_easrc_set_ctx_format

The "ret" in fsl_easrc_set_ctx_format is not initialized, then
the unknown value maybe returned by this function.

Fixes: 955ac624 ("ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
Acked-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/1592816611-16297-1-git-send-email-shengjiu.wang@nxp.com


Signed-off-by: Mark Brown <broonie@kernel.org>