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Clarify the element size of GR_stats when memsetting.

In case Jbig2ArithCx ever changes, but it is unlikely.

--- a/jbig2_symbol_dict.c

+++ b/jbig2_symbol_dict.c

@@ -1043,7 +1043,7 @@

             jbig2_free(ctx->allocator, GB_stats);

             goto cleanup;

         }

-        memset(GR_stats, 0, stats_size);

+        memset(GR_stats, 0, sizeof (Jbig2ArithCx) * stats_size);

     }

     segment->result = (void *)jbig2_decode_symbol_dict(ctx, segment, &params, segment_data + offset, segment->data_length - offset, GB_stats, GR_stats);