Hi,

As noticed by James Blanford <jhblanford@gmail.com>, we were discarding
every other frame in stv06xx and the ov518 (part of ov519.c) drivers.

When we call gspca_frame_add, it returns a pointer to the frame passed in,
unless we call it with LAST_PACKET, when it will return a pointer to a
new frame in which to store the frame data for the next frame. So whenever
calling:
gspca_frame_add(gspca_dev, LAST_PACKET, frame, data, len);
we should do this as:
frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame, data, len);

So that any further data got from of the pkt we are handling in pkt_scan, goes
to the next frame.

We are not doing this in stv06xx.c pkt_scan method, which the cause of what
James is seeing. So I started checking all drivers, and we are not doing this
either in ov519.c when handling an ov518 bridge. So now the framerate of my
3 ov518 test cams has just doubled. Thanks James!

The attached patch fixes this.

Regards,

Hans