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It is not an error to signal a temporal update while prev_segmap=NULL

Fixes 00000527.ivf in #186.

--- a/src/decode.c

+++ b/src/decode.c

@@ -3205,13 +3205,6 @@

                     f->prev_segmap = f->prev_segmap_ref->data;

                 }

             }

-            // It is an error to signal a temporal update if the

-            // previous frame was the wrong size or had no

-            // segmentation data.

-            if (f->frame_hdr.segmentation.temporal && !f->prev_segmap_ref) {

-                res = -EINVAL;

-                goto error;

-            }

         }

         if (f->frame_hdr.segmentation.update_map) {