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jbig2dec: Check if all arithmetic decoder contexts are initialized.

Previously the IADT and IARI contexts were never checked for having
been successfully initialized, possibly causing uninitialized data
issues later.

--- a/jbig2_symbol_dict.c

+++ b/jbig2_symbol_dict.c

@@ -483,11 +483,11 @@

                                 tparams->IARDH = jbig2_arith_int_ctx_new(ctx);

                                 tparams->IARDX = jbig2_arith_int_ctx_new(ctx);

                                 tparams->IARDY = jbig2_arith_int_ctx_new(ctx);

-                                if ((tparams->IAID == NULL) || (tparams->IAFS == NULL) ||

+                                if ((tparams->IADT == NULL) || (tparams->IAFS == NULL) ||

                                     (tparams->IADS == NULL) || (tparams->IAIT == NULL) ||

-                                    (tparams->IAID == NULL) || (tparams->IARDW == NULL) ||

-                                    (tparams->IARDH == NULL) || (tparams->IARDX == NULL) ||

-                                    (tparams->IARDY == NULL)) {

+                                    (tparams->IAID == NULL) || (tparams->IARI == NULL) ||

+                                    (tparams->IARDW == NULL) || (tparams->IARDH == NULL) ||

+                                    (tparams->IARDX == NULL) || (tparams->IARDY == NULL)) {

                                     jbig2_error(ctx, JBIG2_SEVERITY_WARNING, segment->number, "out of memory creating text region arith decoder entries");

                                     goto cleanup4;

                                 }