V4L/DVB (11272): zr364xx: Remove code for things already done by video_ioctl2

The ->vidioc_(s|g|try|enum)_fmt_vid_cap() methods are only called on
VIDEO_CAPTURE buffers.  Thus, there is no need to check or set the buffer's
'type' field since it must already be set to VIDEO_CAPTURE.  Checking the
buffer type can be removed from zr364xx_vidioc_(s|g|try|enum)_fmt_vid_cap().

The v4l2 core code in v4l2_ioctl will zero out the structure the driver is
supposed to fill in for read-only ioctls.  For read/write ioctls, all the
fields which aren't supplied from userspace will be zeroed out.

Zeroing code can be removed from zr364xx_vidioc_querycap(),
zr364xx_vidioc_enum_input(), zr364xx_vidioc_enum_fmt_vid_cap(), and
zr364xx_vidioc_g_fmt_vid_cap().

Cc: Antoine Jacquet <royale@zerezo.com>
Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/zr364xx.c

@@ -426,7 +426,6 @@ static ssize_t zr364xx_read(struct file *file, char __user *buf, size_t cnt,
 static int zr364xx_vidioc_querycap(struct file *file, void *priv,
 				   struct v4l2_capability *cap)
 {
-	memset(cap, 0, sizeof(*cap));
 	strcpy(cap->driver, DRIVER_DESC);
 	cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_READWRITE;
 	return 0;
@@ -437,8 +436,6 @@ static int zr364xx_vidioc_enum_input(struct file *file, void *priv,
 {
 	if (i->index != 0)
 		return -EINVAL;
-	memset(i, 0, sizeof(*i));
-	i->index = 0;
 	strcpy(i->name, DRIVER_DESC " Camera");
 	i->type = V4L2_INPUT_TYPE_CAMERA;
 	return 0;
@@ -530,11 +527,6 @@ static int zr364xx_vidioc_enum_fmt_vid_cap(struct file *file,
 {
 	if (f->index > 0)
 		return -EINVAL;
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
-	memset(f, 0, sizeof(*f));
-	f->index = 0;
-	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 	f->flags = V4L2_FMT_FLAG_COMPRESSED;
 	strcpy(f->description, "JPEG");
 	f->pixelformat = V4L2_PIX_FMT_JPEG;
@@ -551,8 +543,6 @@ static int zr364xx_vidioc_try_fmt_vid_cap(struct file *file, void *priv,
 		return -ENODEV;
 	cam = video_get_drvdata(vdev);
 
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
 	if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
 		return -EINVAL;
 	if (f->fmt.pix.field != V4L2_FIELD_ANY &&
@@ -578,10 +568,6 @@ static int zr364xx_vidioc_g_fmt_vid_cap(struct file *file, void *priv,
 		return -ENODEV;
 	cam = video_get_drvdata(vdev);
 
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
-	memset(&f->fmt.pix, 0, sizeof(struct v4l2_pix_format));
-	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 	f->fmt.pix.pixelformat = V4L2_PIX_FMT_JPEG;
 	f->fmt.pix.field = V4L2_FIELD_NONE;
 	f->fmt.pix.width = cam->width;
@@ -603,8 +589,6 @@ static int zr364xx_vidioc_s_fmt_vid_cap(struct file *file, void *priv,
 		return -ENODEV;
 	cam = video_get_drvdata(vdev);
 
-	if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
-		return -EINVAL;
 	if (f->fmt.pix.pixelformat != V4L2_PIX_FMT_JPEG)
 		return -EINVAL;
 	if (f->fmt.pix.field != V4L2_FIELD_ANY &&