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jbig2dec: Refinement bitmaps without images should be treated as fatal errors.

--- a/jbig2_refinement.c

+++ b/jbig2_refinement.c

@@ -446,6 +446,8 @@

         ref = jbig2_region_find_referred(ctx, segment);

         if (ref == NULL)

             return jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "could not find reference bitmap");

+        if (ref->result == NULL)

+            return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "reference bitmap has no decoded image");

         /* the reference bitmap is the result of a previous

            intermediate region segment; the reference selection

            rules say to use the first one available, and not to