[media] coda: clear RET_DEC_PIC_SUCCESS flag in prepare_decode

To make sure a set RET_DEC_PIC_SUCCESS flag is not a leftover from
a previous successful run, clear it in prepare_decode.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/platform/coda/coda-bit.c

@@ -1666,6 +1666,9 @@ static int coda_prepare_decode(struct coda_ctx *ctx)
 
 	coda_kfifo_sync_to_device_full(ctx);
 
+	/* Clear decode success flag */
+	coda_write(dev, 0, CODA_RET_DEC_PIC_SUCCESS);
+
 	coda_command_async(ctx, CODA_COMMAND_PIC_RUN);
 
 	return 0;