Merge commit 'b1bb8fb8'

* commit 'b1bb8fb8':
  svq1dec: check that the reference frame has the same dimensions as the current one

Conflicts:
	libavcodec/svq1dec.c

See: 3b57bb47Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/svq1dec.c

@@ -689,7 +689,8 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
         } else {
             /* delta frame */
             uint8_t *previous = s->prev->data[i];
-            if (!previous || s->prev->width != cur->width || s->prev->height != cur->height) {
+            if (!previous ||
+                s->prev->width != s->width || s->prev->height != s->height) {
                 av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
                 result = AVERROR_INVALIDDATA;
                 goto err;