[media] media: davinci: vpif: Add return code check at vb2_queue_init()

from commit with id 896f38f5
it's mandatory to check the return code of vb2_queue_init().

Signed-off-by: Lad, Prabhakar <prabhakar.lad@ti.com>
Signed-off-by: Manjunath Hadli <manjunath.hadli@ti.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>