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jbig2dec: When a page fails to complete, handle as an error.

Previously this only caused a warning message but didn't fail,
but failing to complete a page means the parsing is somehow broken,
and so it ought to be best to treat it as a fatal error.

--- a/jbig2dec.c

+++ b/jbig2dec.c

@@ -494,8 +494,10 @@

             /* handle embedded streams and work around broken CVision embedded streams */

             if (params.embedded || f_page != NULL) {

                 code = jbig2_complete_page(ctx);

-                if (code < 0)

+                if (code < 0) {

                     jbig2_error(ctx, JBIG2_SEVERITY_WARNING, -1, "unable to complete page");

+                    goto cleanup;

+                }

             }

             if (params.output_file == NULL) {