minor debug output improvements

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
vpu: encoder: fixed caps to enforce multiples of 8 for frame width&height

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>
vpu: encoder: fixed leak

Signed-off-by: Carlos Rafael Giani <dv@pseudoterminal.org>