media: staging: media: zoran: Rename 'HEnd' to 'h_end'

Rename variable 'HEnd' to 'h_end' to eliminate camelcase
Reported by checkpatch.pl.

Signed-off-by: Zhansaya Bagdauletkyzy <zhansayabagdaulet@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>