media: sun6i-isp: capture: Fix uninitialized variable use

While the stride_chroma variable was previously initialized to zero,
it's actually stride_chroma_div4 that is set to hardware registers.

Initialize it to zero instead to avoid an uninitialized variable use
and get rid of the associated smatch warning.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Fixes: e3185e1d ("media: staging: media: Add support for the Allwinner A31 ISP")
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/staging/media/sunxi/sun6i-isp/sun6i_isp_capture.c

@@ -108,8 +108,8 @@ sun6i_isp_capture_buffer_configure(struct sun6i_isp_device *isp_dev,
 void sun6i_isp_capture_configure(struct sun6i_isp_device *isp_dev)
 {
 	unsigned int width, height;
-	unsigned int stride_luma, stride_chroma = 0;
-	unsigned int stride_luma_div4, stride_chroma_div4;
+	unsigned int stride_luma, stride_chroma;
+	unsigned int stride_luma_div4, stride_chroma_div4 = 0;
 	const struct sun6i_isp_capture_format *format;
 	const struct v4l2_format_info *info;
 	u32 pixelformat;