* tests/gpgscm/scheme-private.h (struct scheme): Remove field 'op'.
* tests/gpgscm/scheme.c (opexe_0): Inline into 'Eval_Cycle'.
(_Error_1): Return the opcode to evaluate next.
(Error_1): Do not return, but set the opcode and goto dispatch.
(Error_0): Likewise.
(s_goto): Likewise.
(s_return): Likewise.
(s_return_enable_gc): Likewise.
(s_thread_to): Remove superfluous cast.
(_s_return): Return the opcode to evaluate next.
(scheme_init_custom_alloc): Adapt to removal of field 'op'.