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Without enough prefix codes, a Huffman table cannot be generated.

Previously this was treated as a warning, possibly allowing access
to uninitialized prefix code entries.

--- a/jbig2_text.c

+++ b/jbig2_text.c

@@ -197,8 +197,10 @@

         }

         if (index < SBNUMSYMS) {

-            jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "runlength codes do not cover the available symbol set");

+            code = jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "runlength codes do not cover the available symbol set");

+            goto cleanup1;

         }

+

         symcodeparams.HTOOB = 0;

         symcodeparams.lines = symcodelengths;

         symcodeparams.n_lines = SBNUMSYMS;