media: platform: exynos4-is: return callee's error code rather than -ENXIO

Clang static analyzer complains that value stored to 'ret' is never read.
Return the callee's error code to fix this.

Signed-off-by: Su Hui <suhui@nfschina.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
1 file changed