sys/oss/gstosssink.c: And another caller that couldn't handle delay < 0 (unsigned integer overflow). Video now contin...

Original commit message from CVS:
* sys/oss/gstosssink.c: (gst_osssink_chain):
And another caller that couldn't handle delay < 0 (unsigned
integer overflow). Video now continues playing on an audio
buffer underrun, and the clock continues working. Audio still
stalls.