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jbig2dec: Plug context leak upon errors.

E.g. failing to complete a page previously caused a context leak.

--- a/jbig2dec.c

+++ b/jbig2dec.c

@@ -373,7 +373,7 @@

 main(int argc, char **argv)

 {

     FILE *f = NULL, *f_page = NULL;

-    Jbig2Ctx *ctx;

+    Jbig2Ctx *ctx = NULL;

     uint8_t buf[4096];

     jbig2dec_params_t params;

     int filearg;

@@ -534,7 +534,6 @@

                 write_document_hash(&params);

         }

-        jbig2_ctx_free(ctx);

     }                           /* end params.mode switch */

@@ -542,6 +541,7 @@

     result = 0;

 cleanup:

+    jbig2_ctx_free(ctx);

     if (params.output_filename)

         free(params.output_filename);

     if (params.hash)