Initializing dev->pix_format.width and dev->pix_format.height to zero

[Alienmaster]

Text to forward to upstream:

Hi,

while reviewing the v4l2loopback code we noticed the following initialization:

https://github.com/umlaeute/v4l2loopback/blob/d01c20cca58772e7b29faef6da393c919a4d531b/v4l2loopback.c#L2523-L2524

As both lines are initialized to 0 instead of the commented-out value we would have expected, we'd like to know if there's a special reason for why both values are initialized to 0 instead of V4L2LOOPBACK_SIZE_DEFAULT_WIDTH or _max_width and V4L2LOOPBACK_SIZE_DEFAULT_HEIGHT or _max_height respectively?