media: chips-media: wave5: Fix spelling mistake "bufferur" -> "buffer"

There is a spelling mistake in a dev_dbg message. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>