[media] media: stb0899_drv: use time_after()

To be future-proof and for better readability the time comparisons are
modified to use time_after() instead of plain, error-prone math.

Signed-off-by: Asaf Vertz <asaf.vertz@tandemg.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --cc drivers/media/dvb-frontends/stb0899_drv.c
Simple merge