media: i2c: imx214: Fix uninitialized variable in imx214_set_ctrl()

commit 38985a25 upstream.

You can't pass uninitialized "ret" variables to cci_write().  It has to
start as zero.

Fixes: 4f0aeba4 ("media: i2c: imx214: Convert to CCI register access helpers")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: André Apitzsch <git@apitzsch.eu>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>