V4L/DVB (7571): mt312: Cleanup buffer variables of read/write functions

Change type of buffer variables from void* to u8* to save some casts.

Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
3 files changed