[media] media: correct return value in dvb_demux_poll

Data type of return value is unsigned int, but in function of dvb_demux_poll,
when the pointer of dmxdevfilter equals NULL, it will return -EINVAL, which
is invalid.

Signed-off-by: Changbing Xiong <cb.xiong@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxdev.c
index c0363f1..7a5c070 100644 (file)
--- a/drivers/media/dvb-core/dmxdev.c
+++ b/drivers/media/dvb-core/dmxdev.c
@@ -1088,7 +1088,7 @@ static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
        unsigned int mask = 0;
 
        if (!dmxdevfilter)
-               return -EINVAL;
+               return POLLERR;
 
        poll_wait(file, &dmxdevfilter->buffer.queue, wait);