If a frame has a width or height of zero, this value will make it into
libobs/media-io/video-frame.c:video_frame_init and cause linesizes or
heights to be zero, which will result in a bmalloc(0) call and OBS will
crash.
Instead of letting the call stack get that far, check the frame width
and height here at the source, log an error, and return early if the
frame width or height are zero.
By not performing an unref on sw_frame before using it again, a memory
"leak" was being created if the frame had side data. This removes a
previously-added check that optionally unrefs sw_frame, and just does
it every tick.
Co-authored-by: pkviet <pkv@obsproject.com>
