V4L/DVB: dvb_dmx_swfilter_section_copy_dump() assignment or addition?

[Roel Kluin <roel.kluin@xxxxxxxxx>]

vi drivers/media/dvb/dvb-core/dvb_demux.c +214

and note:

static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,
                                              const u8 *buf, u8 len)
{
	...
        if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {
		...
                len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;
		    ^------------shouldn't this be '+='?
        }

	if (len <= 0)
                return 0;

Also note: len cannot be less than 0 since it's an u8.
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