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jbig2dec: Indicate success when using arithmetic decoder.

Commit 2b2dcf4ccf401ed210f03c858b304994749fd2b3 accidentally
forgot to set the out parameter to indicate success when the
call was indeed successful.

--- a/jbig2_arith.c

+++ b/jbig2_arith.c

@@ -300,6 +300,7 @@

                 *pcx ^= pqe->mps_xor;

             }

             jbig2_arith_renormd(as);

+            *code = 0;

             return D;

         } else

             return cx >> 7;

@@ -318,6 +319,7 @@

             *pcx ^= pqe->lps_xor;

         }

         jbig2_arith_renormd(as);

+        *code = 0;

         return D;

     }

 }