[media] coda: fix readback of CODA_RET_DEC_SEQ_FRAME_NEED

Previously we'd add one to this value, allocating one additional, superfluous
internal buffer.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

drivers/media/platform/coda.c

@@ -1887,7 +1887,7 @@ static int coda_start_decoding(struct coda_ctx *ctx)
 	v4l2_dbg(1, coda_debug, &dev->v4l2_dev, "%s instance %d now: %dx%d\n",
 		 __func__, ctx->idx, width, height);
 
-	ctx->num_internal_frames = coda_read(dev, CODA_RET_DEC_SEQ_FRAME_NEED) + 1;
+	ctx->num_internal_frames = coda_read(dev, CODA_RET_DEC_SEQ_FRAME_NEED);
 	if (ctx->num_internal_frames > CODA_MAX_FRAMEBUFFERS) {
 		v4l2_err(&dev->v4l2_dev,
 			 "not enough framebuffers to decode (%d < %d)\n",