media: dib8000: Fix comment typo

The double `this' is duplicated in line 3215, remove one.

[hverkuil: while we're at it, fix the 'succedeed' typo as well]

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>