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jbig2dec: Warn on too many symbols in text region, do not report fatal error.

This condition is already taken care of by not continuing to read symbols,
so attempt to proceed with parsing the image.

--- a/jbig2_text.c

+++ b/jbig2_text.c

@@ -291,7 +291,7 @@

                 first_symbol = FALSE;

             } else {

                 if (NINSTANCES > params->SBNUMINSTANCES) {

-                    code = jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number, "too many NINSTANCES (%d) decoded", NINSTANCES);

+                    jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "too many NINSTANCES (%d) decoded", NINSTANCES);

                     break;

                 }

                 /* (3c.ii) / 6.4.8 */