Return an error rather than memcpy()ing beyond the end of the buffer.
Internal callers use appropriate sizes, but digitv_i2c_xfer may not.
Signed-off-by: NAlyssa Milburn <amilburn@zall.org>
Cc: stable@vger.kernel.org
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>