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obu: abort parsing OBU_FRAME if show_existing_frame=1

This is more in line with the behavior from libaom.

Signed-off-by: James Almer <jamrial@gmail.com>

--- a/src/obu.c

+++ b/src/obu.c

@@ -1059,7 +1059,8 @@

             dav1d_data_unref(&c->tile[n].data);

         c->n_tile_data = 0;

         c->n_tiles = 0;

-        if (type == OBU_FRAME_HDR || c->frame_hdr.show_existing_frame) break;

+        if (type == OBU_FRAME_HDR) break;

+        if (c->frame_hdr.show_existing_frame) goto error;

         off += res;

         // fall-through

     case OBU_TILE_GRP: