media: i2c: s5c73m3: return 0 instead of 'ret'.

Since 'ret' is known to be 0, just return '0'. This fixes a smatch warning:

s5c73m3-core.c:439 __s5c73m3_s_stream() warn: missing error code? 'ret'
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/i2c/s5c73m3/s5c73m3-core.c

@@ -435,7 +435,7 @@ static int __s5c73m3_s_stream(struct s5c73m3 *state, struct v4l2_subdev *sd,
 	state->streaming = !!on;
 
 	if (!on)
-		return ret;
+		return 0;
 
 	if (state->apply_fiv) {
 		ret = s5c73m3_set_frame_rate(state);