media: zr364xx: remove redundant assigmnent to idx, clean up code

The variable cable_type is being initialized with a value that
is never read and is being re-assigned a little later on. Replace
the redundant initializtion with the assignment that occurs a little
later. Also initialize frm too rather than have a later assignment.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/usb/zr364xx/zr364xx.c

@@ -555,14 +555,12 @@ static int zr364xx_read_video_callback(struct zr364xx_camera *cam,
 {
 	unsigned char *pdest;
 	unsigned char *psrc;
-	s32 idx = -1;
-	struct zr364xx_framei *frm;
+	s32 idx = cam->cur_frame;
+	struct zr364xx_framei *frm = &cam->buffer.frame[idx];
 	int i = 0;
 	unsigned char *ptr = NULL;
 
 	_DBG("buffer to user\n");
-	idx = cam->cur_frame;
-	frm = &cam->buffer.frame[idx];
 
 	/* swap bytes if camera needs it */
 	if (cam->method == METHOD0) {