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obu: free Metadata buffers at the start of a new Sequence

They only apply to the old one.

--- a/src/obu.c

+++ b/src/obu.c

@@ -1243,6 +1243,10 @@

             c->frame_hdr = NULL;

         else if (memcmp(seq_hdr, c->seq_hdr, sizeof(*seq_hdr))) {

             c->frame_hdr = NULL;

+            c->mastering_display = NULL;

+            c->content_light = NULL;

+            dav1d_ref_dec(&c->mastering_display_ref);

+            dav1d_ref_dec(&c->content_light_ref);

             for (int i = 0; i < 8; i++) {

                 if (c->refs[i].p.p.data[0])

                     dav1d_thread_picture_unref(&c->refs[i].p);