[media] videobuf2: Add debug print for the output buffer plane lengths checks

Add debug print so it's easier to find any errors resulting from
the planes' configuration checks added in commit 8023ed09
"videobuf2-core: Verify planes lengths for output buffers".
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Acked-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: NMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/v4l2-core/videobuf2-core.c

@@ -1207,8 +1207,11 @@ static int __buf_prepare(struct vb2_buffer *vb, const struct v4l2_buffer *b)
 	int ret;
 
 	ret = __verify_length(vb, b);
-	if (ret < 0)
+	if (ret < 0) {
+		dprintk(1, "%s(): plane parameters verification failed: %d\n",
+			__func__, ret);
 		return ret;
+	}
 
 	switch (q->memory) {
 	case V4L2_MEMORY_MMAP: